Merge pull request 'feat/estimate' (#50) from feat/estimate into main

Reviewed-on: #50

.vscode/tasks.json

@@ -7,7 +7,7 @@
           "fileLocation": ["relative", "${workspaceFolder}"],
           "source": "dotnet",
           "pattern": {
-            "regexp": "^\\s+(.*)\\((\\d+),(\\d+)\\):\\s+(error|warning) (.+): (.*)$",
+            "regexp": "^\\s*(.*)\\((\\d+),(\\d+)\\):\\s+(error|warning) (.*)$",
             "file": 1,
             "line": 2,
             "column": 3,

CHANGELOG.md

@@ -1,5 +1,61 @@
 # Changelog
 
+## [1.0.8-rc12] - unstable
+
+### Added
+
+* [PostIt] Nouveau helper d'image `ImageHelper` pour charger des bitmaps depuis les ressources et depuis le web.
+* [PostIt] Affichage de l'avatar XS dans la liste des performers d'activites, avec fallback visuel (initiale utilisateur).
+* [PostIt.Tests] Nouveaux tests autour des URLs avatar et de la source d'autorite.
+* [contrib] Ajout d'un `README.md` utilitaire pour les symboles/icones.
+
+### Changed
+
+* [PostIt] Les avatars ne sont plus relies en string sur `Image.Source`: ils sont telecharges et lies en `Bitmap`.
+* [Yavsc.Api.Client] `ActivityApiClient` accepte une base d'avatar dediee et construit les URLs avatar depuis l'autorite d'identification.
+* [PostIt] Le header de `MainPage` n'utilise plus `ScrollViewer`; remplacement par une barre de commandes basee sur `WrapPanel`.
+* [PostIt] Alignement de la navigation blogs: renommage `PushMainPageAsync` -> `PushBlogsPageAsync` et ajustement de `HomePageViewModel`.
+
+### Fixed
+
+néant
+
+## [1.0.8-rc11] - unstable
+
+### Added
+
+nothing
+
+### Changed
+
+* [Yavsc.Api.Test] Mise a jour de `Microsoft.EntityFrameworkCore.Sqlite` vers `10.0.11` afin de supprimer l'alerte NU1903 liee a `SQLitePCLRaw.lib.e_sqlite3` 2.1.11.
+* [Yavsc.Org] Nettoyage de la configuration NuGet pour le restore: suppression du fichier local `Directory.Packages.props` au profit du fichier racine centralise.
+* [Yavsc.Org] Suppression de references de packages redondantes dans le projet, sans impact fonctionnel attendu.
+
+### Fixed
+
+* [Yavsc.Api.Test] Le restore n'emet plus le warning de vulnerabilite `NU1903` sur `SQLitePCLRaw.lib.e_sqlite3`.
+* [Yavsc.Org] Suppression d'une vulnerabilite de severite elevee sur AutoMapper apres publication et consommation de la nouvelle version candidate de `HigginsSoft.IdentityServer8`.
+
+## [1.0.8-rc10] - unstable
+
+### Added
+
+* [PostIt] Une page d'historique des commandes billing permet maintenant d'ouvrir une commande existante.
+* [PostIt] Une vue "Demandes en cours" en lecture seule est disponible pour le performer, filtrée sur les statuts actifs (Inserted, Accepted, InProgress).
+* [Yavsc.Org] Nouvelles entités `Country` et `PerformerCodeInputValidation` pour piloter la validation du code entreprise performer par pays.
+
+### Changed
+
+* [PostIt] La page détail billing se préremplit depuis une commande existante (Rdv, Brush, MBrush) et passe en mode mise à jour.
+* [Yavsc.Org] Le formulaire `Manage/SetActivity` inclut désormais le pays d'exercice (`fr`, `en`, `pt`) et applique la regex associée au champ `SIREN`.
+* [Yavsc.Org] La vérification externe du numéro d'entreprise est conservée uniquement pour le pays `fr`.
+
+### Fixed
+
+* [PostIt] Le flux historique n'est plus limité à une simple liste: l'action d'ouverture charge la commande cible puis navigue vers la page détail.
+* [Yavsc.Org] Le champ `SIREN` n'est plus validé avec une règle unique indépendante du pays d'exercice.
+
 ## [1.0.8-rc9] - unstable
 
 ### Added

CONTRIBUTING.md

@@ -49,6 +49,19 @@ Les tests sont répartis en :
   item « Tests d'intégration smoke par BC ».
 - `src/PostIt.Tests/` — tests unitaires du client desktop PostIt.
 
+## Onboarding assiste par agents IA
+
+Pour accelerer la prise en main du depot avec Copilot/Plan/Explore :
+
+- Parcours pas-a-pas : [doc/onboarding-agents.md](./doc/onboarding-agents.md)
+- Playbook d'usage des agents : [doc/agent-playbook.md](./doc/agent-playbook.md)
+- Matrice intentions -> agent -> preuves : [doc/agent-intent-matrix.md](./doc/agent-intent-matrix.md)
+
+Regle minimale en contribution assistee par agent :
+- expliciter l'impact architecture,
+- justifier le niveau de tests execute,
+- documenter les risques residuels.
+
 ## Le CHANGELOG.md
 
 Le `CHANGELOG.md` est un document de changement de version
@@ -61,8 +74,8 @@ et ce projet adhère au [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 À noter : la **parité du numéro de patch** porte une signification de canal :
 
-- **patch pair** (ex. `1.0.0`, `1.0.2`) → **stable**
-- **patch impair** (ex. `1.0.1`, `1.0.3`) → **preview**
+- **patch pair** (ex. `1.0.0`, `1.0.2`) → **preview**
+- **patch impair** (ex. `1.0.1`, `1.0.3`) → **stable**
 - **suffixe** (ex. `1.0.0-rc1`, `1.0.0-alpha`) → **instable**
 
 Cette convention est partagée avec le dépôt

Directory.Packages.props

@@ -1,15 +1,31 @@
 <Project>
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+    <IdentityServer8Version>8.1.0-pazofrc007</IdentityServer8Version>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="coverlet.collector" Version="10.0.1" />
-    <PackageVersion Include="HigginsSoft.IdentityServer8" Version="8.1.0-alpha.171" />
-    <PackageVersion Include="HigginsSoft.IdentityServer8.EntityFramework" Version="8.1.0-alpha.171" />
-    <PackageVersion Include="IdentityModel.OidcClient" Version="6.0.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.IdentityModel.Tokens" Version="8.2.1" />
-    <PackageVersion Include="System.IdentityModel.Tokens.Jwt" Version="8.2.1" />
+    <PackageVersion Include="System.Security.Cryptography.Pkcs" Version="10.0.9" />
+
+    <PackageVersion Include="HigginsSoft.IdentityServer8" Version="$(IdentityServer8Version)" />
+    <PackageVersion Include="HigginsSoft.IdentityServer8.AspNetIdentity" Version="$(IdentityServer8Version)" />
+    <PackageVersion Include="HigginsSoft.IdentityServer8.EntityFramework" Version="$(IdentityServer8Version)" />
+    <PackageVersion Include="HigginsSoft.IdentityServer8.EntityFramework.Storage" Version="$(IdentityServer8Version)" />
+    <PackageVersion Include="HigginsSoft.IdentityServer8.Security" Version="$(IdentityServer8Version)" />
+    <PackageVersion Include="HigginsSoft.IdentityServer8.Storage" Version="$(IdentityServer8Version)" />
+
+    <PackageVersion Include="AsciiDocSharp" Version="0.1.0" />
+    <PackageVersion Include="AsciiDocSharp.Converters.Html" Version="0.1.0" />
+
+    <PackageVersion Include="BouncyCastle.Cryptography" Version="2.6.2" />
+
+    <PackageVersion Include="Google.Apis.Compute.v1" Version="1.74.0.4138" />
+
+    <PackageVersion Include="Microsoft.AspNetCore.Antiforgery" Version="2.3.11" />
+    <PackageVersion Include="Microsoft.AspNetCore.Authentication.Google" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.AspNetCore.SignalR" Version="1.2.11" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.9" />
     <PackageVersion Include="Microsoft.AspNetCore.Hosting" Version="2.3.11" />
     <PackageVersion Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.9" />
     <PackageVersion Include="Microsoft.AspNetCore.Identity.UI" Version="10.0.9" />
@@ -17,10 +33,20 @@
     <PackageVersion Include="Microsoft.AspNetCore.Razor" Version="2.3.0" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.9" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.11" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.9" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
     <PackageVersion Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="10.0.2" />
+
+    <PackageVersion Include="Swashbuckle.AspNetCore" Version="10.2.2" />
+
+    <PackageVersion Include="coverlet.collector" Version="10.0.1" />
+
+    <PackageVersion Include="IdentityModel.OidcClient" Version="6.0.0" />
+
+    <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.IdentityModel.Tokens" Version="8.2.1" />
+    <PackageVersion Include="System.IdentityModel.Tokens.Jwt" Version="8.2.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="xunit.v3" Version="3.2.2" />
     <PackageVersion Include="xunit.v3.common" Version="3.2.2" />

README.md

@@ -28,6 +28,10 @@ sous [`doc/`](./doc/). Voir l'[index de la documentation](./doc/README.md)
 pour le sommaire complet. La racine de l'architecture est
 [Architecture.md](./doc/Architecture.md).
 
+Pour une prise en main guidee avec agents IA:
+- parcours onboarding: [doc/onboarding-agents.md](./doc/onboarding-agents.md)
+- playbook d'usage: [doc/agent-playbook.md](./doc/agent-playbook.md)
+
 
 # Construction et déploiement
 

ROADMAP.md

@@ -68,7 +68,7 @@ Trois principes non négociables traversent tous les jalons :
 >
 > Chaque jalon a un **critère de sortie** vérifiable.
 
-### Jalon 0 — Fondations techniques *(en cours)*
+### Jalon 0 — Fondations techniques
 
 > Cible : pouvoir parler du domaine sans se battre avec le runtime.
 
@@ -81,7 +81,7 @@ Trois principes non négociables traversent tous les jalons :
 
 ---
 
-### Jalon 1 — Prestation signée de bout en bout
+### Jalon 1 — Prestation signée de bout en bout *(en cours)*
 
 > Cible : un projet client/fournisseur aboutit à un **devis signé par les deux parties**, traçable, avec notifications.
 

contrib/.env-sample

@@ -0,0 +1,24 @@
+# parametres de déploiement au Makefile
+
+POSTGRES_HOST=localhost
+POSTGRES_PORT=5432
+POSTGRES_DB=yavsc
+POSTGRES_USER=yavsc
+POSTGRES_PASSWORD=<your-password-here>
+
+HTTP_HOST=localhost
+
+Org_PORT=83
+Blogs_PORT=85
+Api_PORT=87
+
+PostIt_CLIENT_ID=postit
+
+ASPNETCORE_Smtp__Host="mercure.pschneider.fr"
+ASPNETCORE_Smtp__Port=465
+ASPNETCORE_Smtp__SenderName="Paul Schneider"
+ASPNETCORE_Smtp__SenderEmail="paul@pschneider.fr"
+ASPNETCORE_Smtp__UserName="paul"
+ASPNETCORE_Smtp__Password="<your-smtp-password-here>"
+
+DESTDIR=/srv/www/yavsc

contrib/Makefile

@@ -1,4 +1,4 @@
-APP_PROJECT_NAMES=Org Blogs
+APP_PROJECT_NAMES=Org Blogs Api
 SLNDIR=..
 
 include $(SLNDIR)/.env
@@ -9,9 +9,11 @@ generated/:
 
 generated/yavscOrg.service:
 generated/yavscBlogs.service:
+generated/yavscApi.service:
 
 generated/yavsc%.service: generated/ template.service $(SLNDIR)/.env
 	@cat template.service | APP_NAME="$*" \
+	DESTDIR="$(DESTDIR)" \
 	HTTP_HOST="$(HTTP_HOST)" \
 	HTTP_PORT="$*_$(HTTP_PORT)" \
 	BASEAPPDIR="$(BASEAPPDIR)" \
@@ -33,11 +35,12 @@ generated/yavsc%.service: generated/ template.service $(SLNDIR)/.env
 	@echo Created service file: $@
 
 
-copy-services: copy-service-Org copy-service-Blogs
+copy-services: copy-service-Org copy-service-Blogs copy-service-Api
 copy-service-Org: /etc/systemd/system/yavscOrg.service
 copy-service-Blogs: /etc/systemd/system/yavscBlogs.service
+copy-service-Api: /etc/systemd/system/yavscApi.service
 
-copy-binaries: build_publish_Org build_publish_Blogs stop-services
+copy-binaries: build_publish_Org build_publish_Blogs build_publish_Api stop-services
 	@for project in $(APP_PROJECT_NAMES); \
 		do LCAPI=$$(echo $${project}|tr [:upper:] [:lower:]) ; \
 		echo "$${project} -> $${LCAPI}" ; \
@@ -60,6 +63,8 @@ copy-binaries: build_publish_Org build_publish_Blogs stop-services
 build_publish_%: clean_publish_dir_%
 	@ASPNETCORE_ENV=$(CONFIGURATION) dotnet publish $(SLNDIR)/src/Yavsc.$*/Yavsc.$*.csproj
 
+build_publish: build_publish_Org build_publish_Blogs build_publish_Api
+
 clean_publish_dir_%:
 	@rm -rf $(SLNDIR)/src/Yavsc.$*/bin/$(CONFIGURATION)/$(DOTNET_FRAMEWORK)/publish
 
@@ -84,6 +89,7 @@ stop-services:
 
 $(SLNDIR)/src/Yavsc.Org/bin/$(CONFIGURATION)/$(DOTNET_FRAMEWORK)/publish: build_publish
 $(SLNDIR)/src/Yavsc.Blogs/bin/$(CONFIGURATION)/$(DOTNET_FRAMEWORK)/publish: build_publish
+$(SLNDIR)/src/Yavsc.Api/bin/$(CONFIGURATION)/$(DOTNET_FRAMEWORK)/publish: build_publish
 
 showConfig:
 	@echo CONFIGURATION: $(CONFIGURATION)
@@ -92,4 +98,3 @@ showConfig:
 clean:
 	@rm -rf generated
 
-.PHONY: build_publish mep showConfig copy-service-Org copy-service-Blogs reinstall clean

contrib/README.md

@@ -0,0 +1,5 @@
+# Read me
+
+## Note aux icones
+
+㝉®🅬⛒⛑🩎🩺🞫🞮🞕🞖🞆🔴🔵🔲🖂🔧🔩🔐🔌💾💼💬💭👿👾🏷🎯🏹🌍🎎💩

contrib/tmp/yavscBlogs.service

@@ -0,0 +1,37 @@
+[Unit]
+Description=yavsc-Blogs
+After=syslog.target
+After=network.target
+Wants=postgresql.service
+After=postgresql.service
+
+[Service]
+RestartSec=5s
+Type=simple
+User=yavsc
+Group=yavsc
+WorkingDirectory=/srv/www/yavsc
+ExecStart=/srv/www/yavsc/Yavsc.Blogs
+Restart=always
+Environment="HOME="
+Environment="ANTHROPIC_API_KEY=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"
+Environment="ANTHROPIC_MAX_TOKENS=255"
+Environment="ASPNETCORE_Environment="
+Environment="ASPNETCORE_Kestrel__Endpoints__Http=http://localhost:Blogs_"
+Environment="ASPNETCORE_ConnectionStrings__YavscConnection=Server=localhost;Port=5432;Database=yavsc;Username=yavsc;Password=4T/X+fOnE;"
+
+Environment="ASPNETCORE_Smtp__Host=\"mercure.pschneider.f\""
+Environment="ASPNETCORE_Smtp__Port=465"
+Environment="ASPNETCORE_Smtp__SenderName=\"Paul Schneider\""
+Environment="ASPNETCORE_Smtp__SenderEmail=\"paul@pschneider.fr\""
+Environment="ASPNETCORE_Smtp__UserName=\"paul\""
+Environment="ASPNETCORE_Smtp__Password=\"j\0Dsn5=t\""
+
+CapabilityBoundingSet=CAP_NET_BIND_SERVICE
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+StandardOutput=syslog
+StandardError=syslog
+SyslogIdentifier=yavscBlogs
+
+[Install]
+WantedBy=multi-user.target

doc/README.md

@@ -18,6 +18,9 @@ La racine de l'architecture est [Architecture.md](Architecture.md).
 | [architecture/postit.md](architecture/postit.md) | PostIt — topologie des projets, ViewLocator custo, navigation, DI, conventions de binding |
 | [architecture/decoupage-organisation.md](architecture/decoupage-organisation.md) | Découpage des projets .NET (Abstract, Server, Org, Api, Blogs, Web, Org.Tests) |
 | [testing.md](testing.md) | Stratégie de test : conventions des dossiers, EF Core in-memory, auth stubs, scaffold partagé |
+| [onboarding-agents.md](onboarding-agents.md) | Parcours pas-à-pas pour prise en main agents IA + architecture + tests |
+| [agent-playbook.md](agent-playbook.md) | Playbook d'usage de Copilot, Plan, Explore avec scénarios et anti-patterns |
+| [agent-intent-matrix.md](agent-intent-matrix.md) | Matrice intentions développeur -> agent -> preuves attendues |
 
 ## Roadmap & design exploration
 

doc/agent-intent-matrix.md

@@ -0,0 +1,20 @@
+# Matrice intentions -> agent -> preuves
+
+Cette matrice aide a choisir rapidement l'agent adapte et a exiger
+une sortie verifiable.
+
+| Intention developpeur | Agent principal | Entrees minimales | Sortie minimale attendue | Verification |
+|---|---|---|---|---|
+| Comprendre un BC avant changement | Explore | BC cible, profondeur, contrainte de perimetre | Composants, points d'entree, tests relies, risques | Lire les fichiers cites + confirmer tests proposes |
+| Decomposer une tache transverse | Plan | Objectif, contraintes, definition of done | Etapes ordonnees, dependances, criteres de verif | Verifier que chaque etape a une preuve observable |
+| Implementer une modif locale | Copilot | Fichier cible, comportement attendu, conventions | Patch minimal, justification courte | Build/test du projet impacte |
+| Ajouter un test smoke | Copilot (+Explore) | Route/endpoint, projet de test cible | Test + commande cible | Execution test cible |
+| Corriger une regression | Plan + Copilot | Symptome, zone suspecte, test attendu | Fix + test NonRegression | Test rouge avant, vert apres |
+| Diagnostiquer flux PostIt/OIDC | Explore + Plan | Flux, symptome, plateforme | Carte du flux + hypotheses testables | Verification manuelle + tests existants |
+
+## Regles d'arbitrage
+
+- Si l'intention est "comprendre": commencer par Explore.
+- Si l'intention est "orchestrer": commencer par Plan.
+- Si l'intention est "produire": utiliser Copilot apres cadrage.
+- Si une sortie n'inclut pas de preuve, elle est incomplete.

doc/agent-playbook.md

@@ -0,0 +1,101 @@
+# Playbook d'usage des agents IA (Yavsc)
+
+Ce playbook normalise l'usage de Copilot, Plan et Explore dans le depot.
+Il privilegie des sorties verifiables: fichiers, commandes tests, risques.
+
+## Quand utiliser quel agent
+
+- Plan: quand la tache est ambigue, transverse ou risquee.
+- Explore: quand il faut cartographier rapidement des zones du code.
+- Copilot: quand les specifications sont claires et localisees.
+
+## Prompt type (base)
+
+Utiliser ce squelette avant toute tache non triviale:
+
+```text
+Contexte: <projet/fichier/fonction>
+Objectif: <resultat observable>
+Contraintes: <style, archi, perimetre>
+Verification: <tests exacts a lancer>
+Sortie attendue: <fichiers modifies + risques>
+```
+
+## 4 scenarios de reference
+
+## 1) Explorer un bounded context
+
+Intention:
+- Comprendre ou implementer un changement dans un BC sans regression laterale.
+
+Prompt minimal:
+```text
+Explore le BC <nom> avec profondeur medium.
+Retour: composants touches, points d'entree, tests existants et risques.
+```
+
+Preuves attendues:
+- Carte des fichiers a modifier.
+- Test(s) smoke/mandatory proposes.
+
+## 2) Ajouter un smoke test
+
+Intention:
+- Couvrir rapidement un endpoint ou une route publique.
+
+Prompt minimal:
+```text
+Propose un smoke test pour <route/endpoint> dans le projet de test approprie.
+Respecte les conventions de doc/testing.md.
+```
+
+Preuves attendues:
+- Fichier test cree/modifie.
+- Commande precise pour executer le test cible.
+
+## 3) Corriger une regression backend API
+
+Intention:
+- Corriger un bug sans casser un flux voisin.
+
+Prompt minimal:
+```text
+Planifie puis implemente un fix de <symptome> dans <projet>.
+Ajoute/ajuste un test NonRegression rouge puis vert.
+```
+
+Preuves attendues:
+- Explication cause racine.
+- Test non-regression associe.
+- Commande d'execution et resultat attendu.
+
+## 4) Tracer un flux PostIt/OIDC
+
+Intention:
+- Localiser une cassure d'authentification entre client et serveur.
+
+Prompt minimal:
+```text
+Cartographie le flux OIDC PostIt: entrypoints, callback, stockage token,
+refresh. Donne points de rupture probables et tests/verification proposes.
+```
+
+Preuves attendues:
+- Liste ordonnee des etapes du flux.
+- Fichiers critiques.
+- Hypotheses testables.
+
+## Anti-patterns a eviter
+
+- Prompt sans objectif verifiable.
+- Demande trop large sans perimetre de fichiers.
+- Validation basee uniquement sur "ca semble correct".
+- Pas de lien entre changement et niveau de test.
+
+## Gate PR minimale (agent-assiste)
+
+Avant validation:
+- Impact architecture explicite.
+- Rationale de choix agent explicite.
+- Test(s) executes et justifies.
+- Risques residuels documentes.

doc/onboarding-agents.md

@@ -0,0 +1,73 @@
+# Onboarding guide: agents IA + architecture + tests
+
+Ce guide est optimise pour accelerer la prise en main des agents IA
+(Copilot, Plan, Explore) dans Yavsc, avec une verification rapide
+par les tests.
+
+## Resultat attendu
+
+A la fin du parcours, un contributeur doit pouvoir:
+- Identifier les projets impactes par une modification.
+- Choisir l'agent adapte a l'intention de travail.
+- Produire une proposition de changement verifiable par les tests.
+
+## Parcours en 3 modules
+
+## Module A - Comprendre le terrain (30-45 min)
+
+Objectif: acquerir une lecture fiable de l'architecture.
+
+1. Lire [README.md](../README.md) puis [Architecture.md](Architecture.md).
+2. Lire [architecture/decoupage-organisation.md](architecture/decoupage-organisation.md).
+3. Selon le domaine:
+   - Backend/API: [architecture/workflow-multi-parties.md](architecture/workflow-multi-parties.md)
+   - PostIt: [architecture/postit.md](architecture/postit.md) puis [architecture/postit-oidc.md](architecture/postit-oidc.md)
+
+Definition of done:
+- Expliquer en 5 phrases quelles couches sont touchees.
+- Citer le ou les points d'entree applicatifs a verifier.
+
+## Module B - Boucle tests rapide (20-30 min)
+
+Objectif: verifier rapidement sans lancer toute la suite.
+
+1. Lire [testing.md](testing.md).
+2. Lancer les smoke tests d'abord, puis mandatory selon le projet.
+3. N'elargir au test complet que si le scope depasse le BC touche.
+
+Definition of done:
+- Fournir la commande test executee.
+- Expliquer pourquoi ce niveau de test est suffisant.
+
+## Module C - Usage agentique en production (30-40 min)
+
+Objectif: utiliser les agents comme accelerateurs, pas comme boites noires.
+
+1. Plan: decomposer la tache en etapes verifiables.
+2. Explore: collecter le contexte code/doc precise.
+3. Copilot: implementer localement et verifier.
+
+Regles:
+- Toujours donner un contexte explicite (fichier, but, contrainte).
+- Demander des preuves observables (fichiers modifies, tests, risques).
+- Refuser toute sortie non verifiable.
+
+Definition of done:
+- Une tache simple est livree avec:
+  - Plan
+  - Changement local
+  - Preuve par test
+
+## Routine continue (sans echeance fixe)
+
+Rituels recommandes:
+- Hebdo: revue des prompts qui ont bien fonctionne.
+- Mensuel: mise a jour du present guide et du playbook.
+- A chaque incident: ajouter un anti-pattern dans le playbook.
+
+## Check-list de validation
+
+- Le changement indique son impact architecture.
+- Le choix de l'agent est justifie.
+- La preuve test est incluse.
+- Les risques residuels sont explicitement listes.

src/PostIt/PostIt.Android/Application.cs

@@ -1,4 +1,5 @@
 using Android.App;
+using Android;
 using Android.Runtime;
 using Avalonia;
 using Avalonia.Android;
@@ -9,6 +10,9 @@ using Avalonia.Controls;
 using Avalonia.Styling;
 using Yavsc.Api.Client;
 
+[assembly: UsesPermission(Manifest.Permission.AccessFineLocation)]
+[assembly: UsesPermission(Manifest.Permission.AccessCoarseLocation)]
+
 namespace PostIt.Android
 {
     [Application]

src/PostIt/PostIt.Android/MainActivity.cs

@@ -57,6 +57,17 @@ public class MainActivity : AvaloniaMainActivity
 
     }
 
+    public override void OnRequestPermissionsResult(int requestCode, string[]? permissions, Permission[]? grantResults)
+    {
+        if (PostIt.Android.Services.AndroidCurrentLocationProvider
+            .HandlePermissionResult(requestCode, grantResults))
+        {
+            return;
+        }
+
+        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+    }
+
     internal static class AndroidOidcCallbackSink
     {
         private static System.Threading.Tasks.TaskCompletionSource<string>? _pending;

src/PostIt/PostIt.Android/PlatformBootstrap.cs

@@ -14,11 +14,12 @@ internal static class PlatformBootstrap
 {
     internal static void InitPlatform()
     {
-
         Platform.CreateBrowser = () =>
         {
             var activity = MainActivity.Current;
             return activity is null ? null : new AndroidSystemBrowser(activity);
         };
+
+        Platform.TryGetCurrentLocationAsync = AndroidCurrentLocationProvider.TryGetCurrentLocationAsync;
     }
 }

src/PostIt/PostIt.Android/Services/AndroidCurrentLocationProvider.cs

@@ -0,0 +1,130 @@
+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Android;
+using Android.App;
+using Android.Content.PM;
+using Android.Locations;
+using AndroidX.Core.App;
+using AndroidX.Core.Content;
+using PostIt.Services;
+
+namespace PostIt.Android.Services;
+
+internal static class AndroidCurrentLocationProvider
+{
+    public static async Task<CurrentLocationResult> TryGetCurrentLocationAsync(CancellationToken cancellationToken)
+    {
+        var activity = MainActivity.Current;
+        if (activity is null)
+        {
+            return CurrentLocationResult.Unavailable("L'activité Android n'est pas encore prête.");
+        }
+
+        var permissionGranted = await LocationPermissionBroker.EnsureGrantedAsync(activity, cancellationToken).ConfigureAwait(false);
+        if (!permissionGranted)
+        {
+            return CurrentLocationResult.PermissionDenied();
+        }
+
+        var locationManager = activity.GetSystemService(global::Android.Content.Context.LocationService) as LocationManager;
+        if (locationManager is null)
+        {
+            return CurrentLocationResult.Unavailable("Le service de localisation Android est indisponible.");
+        }
+
+        var location = locationManager.GetProviders(enabledOnly: true)?
+            .Select(provider => locationManager.GetLastKnownLocation(provider))
+            .Where(candidate => candidate is not null)
+            .OrderByDescending(candidate => candidate!.Time)
+            .ThenBy(candidate => candidate!.Accuracy)
+            .FirstOrDefault();
+
+        if (location is null)
+        {
+            return CurrentLocationResult.Unavailable("Aucune position n'est disponible. Activez la localisation du système puis réessayez.");
+        }
+
+        return CurrentLocationResult.Success(location.Latitude, location.Longitude);
+    }
+
+    public static bool HandlePermissionResult(int requestCode, Permission[]? grantResults)
+        => LocationPermissionBroker.HandleResult(requestCode, grantResults);
+
+    private static class LocationPermissionBroker
+    {
+        private const int RequestCode = 4042;
+        private static readonly string[] RequestedPermissions =
+        {
+            Manifest.Permission.AccessFineLocation,
+            Manifest.Permission.AccessCoarseLocation,
+        };
+
+        private static readonly object SyncRoot = new();
+        private static TaskCompletionSource<bool>? _pendingRequest;
+
+        public static Task<bool> EnsureGrantedAsync(Activity activity, CancellationToken cancellationToken)
+        {
+            if (HasLocationPermission(activity))
+            {
+                return Task.FromResult(true);
+            }
+
+            lock (SyncRoot)
+            {
+                if (_pendingRequest is null)
+                {
+                    _pendingRequest = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
+                    ActivityCompat.RequestPermissions(activity, RequestedPermissions, RequestCode);
+                }
+
+                if (!cancellationToken.CanBeCanceled)
+                {
+                    return _pendingRequest.Task;
+                }
+
+                return WaitAsync(_pendingRequest.Task, cancellationToken);
+            }
+        }
+
+        public static bool HandleResult(int requestCode, Permission[]? grantResults)
+        {
+            if (requestCode != RequestCode)
+            {
+                return false;
+            }
+
+            var granted = grantResults is { Length: > 0 } && grantResults.All(result => result == Permission.Granted);
+            TaskCompletionSource<bool>? pendingRequest;
+            lock (SyncRoot)
+            {
+                pendingRequest = _pendingRequest;
+                _pendingRequest = null;
+            }
+
+            pendingRequest?.TrySetResult(granted);
+            return true;
+        }
+
+        private static bool HasLocationPermission(Activity activity)
+        {
+            return ContextCompat.CheckSelfPermission(activity, Manifest.Permission.AccessFineLocation) == Permission.Granted
+                || ContextCompat.CheckSelfPermission(activity, Manifest.Permission.AccessCoarseLocation) == Permission.Granted;
+        }
+
+        private static async Task<bool> WaitAsync(Task<bool> task, CancellationToken cancellationToken)
+        {
+            using var registration = cancellationToken.Register(() =>
+            {
+                lock (SyncRoot)
+                {
+                    _pendingRequest?.TrySetCanceled(cancellationToken);
+                    _pendingRequest = null;
+                }
+            });
+
+            return await task.ConfigureAwait(false);
+        }
+    }
+}

src/PostIt/PostIt.Tests/ActivitiesPageViewModelTests.cs

@@ -0,0 +1,151 @@
+using System.Net.Http;
+using PostIt.ViewModels;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+
+namespace PostIt.Tests;
+
+public class ActivitiesPageViewModelTests
+{
+    [Fact]
+    public void ActivityApiClient_uses_avatar_authority_when_provided()
+    {
+        var api = new StubActivityApi();
+        var client = new ActivityApiClient(
+            api,
+            "https://api.pschneider.fr/api/v1/",
+            "https://yavsc.pschneider.fr/");
+
+        var url = client.BuildAvatarXsUrl("paul");
+
+        Assert.Equal("https://yavsc.pschneider.fr/avatars/paul.xs.png", url);
+    }
+
+    [Fact]
+    public async Task ActivityApiClient_uses_business_absolute_paths()
+    {
+        var api = new StubActivityApi();
+        var client = new ActivityApiClient(api, "https://business.example/api/v1/");
+        var billingClient = new BillingApiClient(api, "https://business.example/api/v1/");
+
+        await client.GetCatalogAsync("brush", TestContext.Current.CancellationToken);
+        await client.GetUsersAsync("brush-pro", TestContext.Current.CancellationToken);
+        await billingClient.CreateAsync("Rdv", new { Foo = "Bar" }, TestContext.Current.CancellationToken);
+        await billingClient.GetQuerySummariesAsync("Rdv", TestContext.Current.CancellationToken);
+
+        Assert.Equal("https://business.example/api/v1/activity/catalog?parentCode=brush", api.Paths[0]);
+        Assert.Equal("https://business.example/api/v1/activity/brush-pro/users", api.Paths[1]);
+        Assert.Equal("https://business.example/api/v1/billing/Rdv", api.Paths[2]);
+        Assert.Equal("https://business.example/api/v1/billing/Rdv", api.Paths[3]);
+    }
+
+    [Fact]
+    public async Task RefreshAsync_loads_first_activity_then_specialization_performers()
+    {
+        var api = new StubActivityApi();
+        var client = new ActivityApiClient(api, "https://business.example/api/v1/");
+        var billingClient = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ActivitiesPageViewModel(client, billingClient);
+
+        await vm.RefreshAsync();
+
+        Assert.Equal("brush", vm.SelectedActivity?.Code);
+        Assert.Single(vm.Specializations);
+        Assert.Equal("brush", vm.CurrentActivity?.Code);
+        Assert.Single(vm.Performers);
+        Assert.Equal("Alice", vm.Performers[0].UserName);
+        Assert.Equal("https://business.example/avatars/Alice.xs.png", vm.Performers[0].AvatarXsUrl);
+        Assert.True(vm.Performers[0].HasPerformerProfile);
+        Assert.True(vm.Performers[0].IsPerformerActive);
+        Assert.Equal("Actif", vm.Performers[0].PerformerStatusBadgeLabel);
+        Assert.Equal("Pas d'autre activité", vm.Performers[0].ExtraActivityLabel);
+
+        await vm.ShowSpecializationAsync(vm.Specializations[0]);
+
+        Assert.Equal("brush-pro", vm.CurrentActivity?.Code);
+        Assert.Single(vm.Performers);
+        Assert.Equal("Bob", vm.Performers[0].UserName);
+        Assert.Equal("https://business.example/avatars/Bob.xs.png", vm.Performers[0].AvatarXsUrl);
+        Assert.True(vm.Performers[0].HasPerformerProfile);
+        Assert.False(vm.Performers[0].IsPerformerActive);
+        Assert.Equal("Inactif", vm.Performers[0].PerformerStatusBadgeLabel);
+        Assert.Equal("Autres spécialisations: 2", vm.Performers[0].ExtraActivityLabel);
+        Assert.Contains("brush pro", vm.StatusMessage, StringComparison.OrdinalIgnoreCase);
+
+        await vm.ShowSpecializationAsync(null);
+
+        Assert.Equal("brush", vm.CurrentActivity?.Code);
+        Assert.Single(vm.Performers);
+        Assert.Equal("Alice", vm.Performers[0].UserName);
+    }
+
+    private sealed class StubActivityApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public List<string> Paths { get; } = new();
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+
+            if (typeof(T) == typeof(List<ActivityInfo>))
+            {
+                var activities = new List<ActivityInfo>
+                {
+                    new()
+                    {
+                        Code = "brush",
+                        Name = "Brush",
+                        Description = "Coiffure à domicile",
+                        PerformerCount = 1,
+                        Forms = new List<CommandFormSummary>
+                        {
+                            new() { Id = 1, ActionName = "Rdv", Title = "Rendez-vous" }
+                        },
+                        Children = new List<ActivityInfo>
+                        {
+                            new()
+                            {
+                                Code = "brush-pro",
+                                Name = "Brush Pro",
+                                Description = "Spécialisation premium",
+                                ParentCode = "brush",
+                                PerformerCount = 1,
+                                Forms = new List<CommandFormSummary>
+                                {
+                                    new() { Id = 2, ActionName = "Rdv", Title = "Rendez-vous premium" }
+                                }
+                            }
+                        }
+                    }
+                };
+                return Task.FromResult((T)(object)activities);
+            }
+
+            if (typeof(T) == typeof(List<PerformerActivity>))
+            {
+                var performers = path.EndsWith("brush-pro/users", StringComparison.Ordinal)
+                    ? new List<PerformerActivity>
+                    {
+                        new() { PerformerId = "pro-2", HasPerformerProfile = true, Active = false, UserName = "Bob", ActivityCode = "brush-pro", ActivityName = "Brush Pro", ExtraActivityCount = 2 }
+                    }
+                    : new List<PerformerActivity>
+                    {
+                        new() { PerformerId = "pro-1", HasPerformerProfile = true, Active = true, UserName = "Alice", ActivityCode = "brush", ActivityName = "Brush", ExtraActivityCount = 0 }
+                    };
+
+                return Task.FromResult((T)(object)performers);
+            }
+
+            return Task.FromResult(default(T)!);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+            return Task.CompletedTask;
+        }
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/BearerScopeTests.cs

@@ -67,7 +67,7 @@ public class BearerScopeTests
                 Scopes = userScopes,
                 RedirectUri = "postit://callback",
             },
-            BusinessApiUrl = "https://example.invalid/api/v1/",
+            ApiUrl = "https://example.invalid/api/v1/",
         };
 
         var tokensPath = Path.Combine(
@@ -266,7 +266,7 @@ public class BearerScopeTests
             // private HttpClient is independent, so we resolve the
             // absolute URI ourselves from Settings.BusinessApiUrl —
             // the same URL BlogApiClient would have set as BaseAddress.
-            var absolute = new Uri(new Uri(Settings.BusinessApiUrl), path);
+            var absolute = new Uri(new Uri(Settings.ApiUrl), path);
             using var req = new HttpRequestMessage(method, absolute);
             req.Headers.Authorization =
                 new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", _accessToken);

src/PostIt/PostIt.Tests/BillingCommandPageViewModelTests.cs

@@ -0,0 +1,274 @@
+using System.Text.Json;
+using PostIt.Helpers;
+using PostIt.Services;
+using PostIt.ViewModels;
+using PostIt.ViewModels.Commands;
+using Yavsc;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+using Yavsc.Models.Haircut;
+
+namespace PostIt.Tests;
+
+public class BillingCommandPageViewModelTests
+{
+    [Fact]
+    public async Task SubmitAsync_posts_rdv_payload_to_selected_billing_route()
+    {
+        var api = new RecordingApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm =
+          new CommandFormSummary { Id = 12, ActionName = "Rdv", Title = "Rendez-vous" }
+          .CreateCommandPageViewModel(
+            new ActivityInfo { Code = "dev", Name = "Développement" },
+            new ActivityUserDisplayItem { PerformerId = "perf-1", UserName = "Alice" },
+            client) as RdvViewModel;
+
+            vm!.EventDate = DateTime.Parse("2026-09-02 14:30");
+        vm!.Reason = "Point de cadrage";
+        vm!.Address = "1 rue du Test";
+        vm!.Latitude = 48.8566;
+        vm!.Longitude = 2.3522;
+        vm!.Consent = true;
+
+        await vm.SubmitCommand.ExecuteAsync(null);
+
+        Assert.Equal("https://business.example/api/v1/billing/Rdv", api.LastPath);
+        Assert.NotNull(api.LastBody);
+
+        using var json = JsonDocument.Parse(JsonSerializer.Serialize(api.LastBody));
+        Assert.Equal("dev", json.RootElement.GetProperty("ActivityCode").GetString());
+        Assert.Equal("perf-1", json.RootElement.GetProperty("PerformerId").GetString());
+        Assert.Equal("Point de cadrage", json.RootElement.GetProperty("Reason").GetString());
+        Assert.Equal((int)QueryStatus.Inserted, json.RootElement.GetProperty("Status").GetInt32());
+    }
+
+    [Fact]
+    public async Task SubmitAsync_refuses_unsupported_billing_code()
+    {
+        var api = new RecordingApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+
+        var vm =
+         new CommandFormSummary { Id = 13, ActionName = "Book", Title = "Réservation" }
+         .CreateCommandPageViewModel(
+            new ActivityInfo { Code = "book", Name = "Book" },
+            new ActivityUserDisplayItem { PerformerId = "perf-2", UserName = "Bob" },
+            client);
+
+        Assert.Null(vm);
+    }
+
+    [Fact]
+    public async Task SubmitAsync_allows_missing_coordinates_and_omits_them_from_payload()
+    {
+        var api = new RecordingApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm =
+
+        new CommandFormSummary { Id = 12, ActionName = "Rdv", Title = "Rendez-vous" }
+        .CreateCommandPageViewModel(
+            new ActivityInfo { Code = "dev", Name = "Développement" },
+            new ActivityUserDisplayItem { PerformerId = "perf-1", UserName = "Alice" },
+            client) as RdvViewModel;
+        vm!.EventDate = DateTime.Parse("2026-09-02 14:30");
+        vm!.Reason = "Point de cadrage";
+        vm!.Address = "1 rue du Test";
+        vm!.Latitude = null;
+        vm!.Longitude = null;
+        vm!.Consent = true;
+
+        await vm.SubmitCommand.ExecuteAsync(null);
+
+        using var json = JsonDocument.Parse(JsonSerializer.Serialize(api.LastBody));
+        var location = json.RootElement.GetProperty("Location");
+        Assert.Equal("1 rue du Test", location.GetProperty("Address").GetString());
+        Assert.False(location.TryGetProperty("Latitude", out _));
+        Assert.False(location.TryGetProperty("Longitude", out _));
+    }
+
+    [Fact]
+    public async Task UseCurrentLocationAsync_prefills_coordinates_from_platform_provider()
+    {
+        var original = Platform.TryGetCurrentLocationAsync;
+        try
+        {
+            Platform.TryGetCurrentLocationAsync = _ => Task.FromResult(CurrentLocationResult.Success(48.8566, 2.3522));
+
+            var api = new RecordingApi();
+            var client = new BillingApiClient(api, "https://business.example/api/v1/");
+            var vm =
+             new CommandFormSummary { Id = 12, ActionName = "Rdv", Title = "Rendez-vous" }
+             .CreateCommandPageViewModel(
+                new ActivityInfo { Code = "dev", Name = "Développement" },
+                new ActivityUserDisplayItem { PerformerId = "perf-1", UserName = "Alice" },
+                client) as RdvViewModel;
+
+            await vm!.UseCurrentLocationCommand.ExecuteAsync(null);
+
+            Assert.Equal(48.8566, vm!.Latitude);
+            Assert.Equal(2.3522, vm!.Longitude);
+        }
+        finally
+        {
+            Platform.TryGetCurrentLocationAsync = original;
+        }
+    }
+
+    [Fact]
+    public async Task InitializeAsync_loads_prestations_for_brush_and_submit_posts_selected_prestation()
+    {
+        var api = new RecordingApi
+        {
+            HairPrestations = new List<HairPrestationDto>
+            {
+                new() { Id = 10, Title = "Femme · Cheveux mi-longs", Details = "Coupe · Brushing" },
+                new() { Id = 11, Title = "Homme · Cheveux courts", Details = "Coupe · Coiffage" },
+            }
+        };
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm =
+        new CommandFormSummary { Id = 13, ActionName = "Brush", Title = "Coupe" }
+        .CreateCommandPageViewModel(
+            new ActivityInfo { Code = "brush", Name = "Brush" },
+            new ActivityUserDisplayItem { PerformerId = "perf-2", UserName = "Bob" },
+            client) as BrushViewModel;
+        vm!.EventDate = DateTime.Parse("2026-09-02 14:30");
+        vm!.Address = "1 rue du Test";
+        vm!.Latitude = 48.8566;
+        vm!.Longitude = 2.3522;
+        vm!.Consent = true;
+        vm!.AdditionalInfo = "Prévoir shampoing";
+
+        await vm.InitializeAsync();
+        vm.SelectedPrestation = vm.AvailablePrestations[1];
+        await vm.SubmitCommand.ExecuteAsync(null);
+
+        Assert.Equal("https://business.example/api/v1/billing/Brush", api.LastPath);
+        using var json = JsonDocument.Parse(JsonSerializer.Serialize(api.LastBody));
+        Assert.Equal(11, json.RootElement.GetProperty("PrestationId").GetInt32());
+        Assert.Equal("Prévoir shampoing", json.RootElement.GetProperty("AdditionalInfo").GetString());
+    }
+
+    [Fact]
+    public async Task InitializeAsync_loads_prestations_for_mbrush_and_submit_posts_selected_prestations()
+    {
+        var api = new RecordingApi
+        {
+            HairPrestations = new List<HairPrestationDto>
+            {
+                new() { Id = 21, Title = "Femme · Cheveux longs", Details = "Coupe · Couleur" },
+                new() { Id = 22, Title = "Enfant · Cheveux courts", Details = "Coupe · Sans technique" },
+            }
+        };
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm =
+        new CommandFormSummary { Id = 14, ActionName = "MBrush", Title = "Coupe groupée" }
+        .CreateCommandPageViewModel(
+            new ActivityInfo { Code = "mbrush", Name = "MBrush" },
+            new ActivityUserDisplayItem { PerformerId = "perf-3", UserName = "Cara" },
+            client) as MBrushViewModel;
+        vm!.EventDate = DateTime.Parse("2026-09-03 10:00");
+        vm!.Address = "2 rue du Test";
+        vm!.Latitude = 48.8567;
+        vm!.Longitude = 2.3523;
+        vm!.Consent = true;
+
+        await vm.InitializeAsync();
+        vm!.MultiPrestations[0].IsSelected = true;
+        vm!.MultiPrestations[1].IsSelected = true;
+        await vm!.SubmitCommand.ExecuteAsync(null);
+
+        Assert.Equal("https://business.example/api/v1/billing/MBrush", api.LastPath);
+        using var json = JsonDocument.Parse(JsonSerializer.Serialize(api.LastBody));
+        var prestations = json.RootElement.GetProperty("Prestations");
+        Assert.Equal(2, prestations.GetArrayLength());
+        Assert.Equal(21, prestations[0].GetProperty("PrestationId").GetInt32());
+        Assert.Equal(22, prestations[1].GetProperty("PrestationId").GetInt32());
+    }
+
+    [Fact]
+    public async Task InitializeAsync_with_existing_brush_query_prefills_and_submit_updates_query()
+    {
+        var api = new RecordingApi
+        {
+            HairPrestations = new List<HairPrestationDto>
+            {
+                new() { Id = 30, Title = "Femme · Cheveux longs", Details = "Coupe · Brushing" },
+                new() { Id = 31, Title = "Homme · Cheveux courts", Details = "Coupe" },
+            }
+        };
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm =
+           new CommandFormSummary { Id = 13, ActionName = "Brush", Title = "Coupe" }
+         .CreateCommandPageViewModel(
+            new ActivityInfo { Code = "brush", Name = "Brush" },
+            new ActivityUserDisplayItem { PerformerId = "perf-2", UserName = "Bob" },
+            client) as BrushViewModel;
+        await vm!.InitializeAsync(new BillingQueryDetailsDto
+        {
+            Id = 77,
+            BillingCode = "Brush",
+            ActivityCode = "brush",
+            PerformerId = "perf-2",
+            ClientId = "cli-1",
+            EventDate = new DateTime(2026, 9, 2, 14, 30, 0, DateTimeKind.Utc),
+            Consent = true,
+            Status = QueryStatus.Accepted,
+            PrestationId = 30,
+            AdditionalInfo = "Ancienne note",
+            Location = new BillingLocationDto
+            {
+                Address = "1 rue du Test",
+                Latitude = 48.8566,
+                Longitude = 2.3522,
+            }
+        });
+
+        vm!.SelectedPrestation = vm!.AvailablePrestations[1];
+        vm!.AdditionalInfo = "Note mise à jour";
+        await vm!.SubmitCommand.ExecuteAsync(null);
+
+        Assert.Equal(HttpMethod.Put, api.LastMethod);
+        Assert.Equal("https://business.example/api/v1/billing/Brush/77", api.LastPath);
+        Assert.True(vm.IsEditingExisting);
+        Assert.Equal("Mettre à jour la commande", vm.SubmitLabel);
+
+        using var json = JsonDocument.Parse(JsonSerializer.Serialize(api.LastBody));
+        Assert.Equal(77, json.RootElement.GetProperty("Id").GetInt32());
+        Assert.Equal(31, json.RootElement.GetProperty("PrestationId").GetInt32());
+        Assert.Equal("Note mise à jour", json.RootElement.GetProperty("AdditionalInfo").GetString());
+        Assert.Equal((int)QueryStatus.Accepted, json.RootElement.GetProperty("Status").GetInt32());
+    }
+
+    private sealed class RecordingApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public HttpMethod? LastMethod { get; private set; }
+        public string? LastPath { get; private set; }
+        public object? LastBody { get; private set; }
+        public List<HairPrestationDto>? HairPrestations { get; init; }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+            if (typeof(T) == typeof(List<HairPrestationDto>))
+            {
+                return Task.FromResult((T)(object)(HairPrestations ?? new List<HairPrestationDto>()));
+            }
+            return Task.FromResult(default(T)!);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+            return Task.CompletedTask;
+        }
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/BillingQueriesPageViewModelTests.cs

@@ -0,0 +1,134 @@
+using System.Net.Http;
+using PostIt.ViewModels;
+using Yavsc;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+
+namespace PostIt.Tests;
+
+public class BillingQueriesPageViewModelTests
+{
+    [Fact]
+    public async Task RefreshAsync_filters_queries_by_selected_activity_and_performer()
+    {
+        var api = new StubBillingApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new BillingQueriesPageViewModel(
+            new ActivityInfo { Code = "dev", Name = "Développement" },
+            new ActivityUserDisplayItem { PerformerId = "perf-1", UserName = "Alice" },
+            new CommandFormSummary { Id = 1, ActionName = "Rdv", Title = "Rendez-vous" },
+            client);
+
+        await vm.InitializeAsync();
+
+        Assert.Equal("https://business.example/api/v1/billing/Rdv", api.Paths.Single());
+        Assert.Equal(3, vm.Queries.Count);
+        Assert.Contains(vm.Queries, q => q.Description == "Rendez-vous #1");
+        Assert.Contains("3 commande", vm.StatusMessage, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public async Task RefreshAsync_in_readonly_ongoing_mode_keeps_only_ongoing_statuses_and_disables_open()
+    {
+        var api = new StubBillingApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new BillingQueriesPageViewModel(
+            new ActivityInfo { Code = "dev", Name = "Développement" },
+            new ActivityUserDisplayItem { PerformerId = "perf-1", UserName = "Alice" },
+            new CommandFormSummary { Id = 1, ActionName = "Rdv", Title = "Rendez-vous" },
+            client,
+            isReadOnly: true,
+            ongoingOnly: true);
+
+        await vm.InitializeAsync();
+
+        Assert.Equal(2, vm.Queries.Count);
+        Assert.All(vm.Queries, q => Assert.DoesNotContain("Rejected", q.StatusLabel, StringComparison.OrdinalIgnoreCase));
+        Assert.Contains("lecture seule", vm.StatusMessage, StringComparison.OrdinalIgnoreCase);
+        Assert.False(vm.CanOpenDetails);
+
+        vm.SelectedQuery = vm.Queries[0];
+        Assert.False(vm.OpenSelectedQueryCommand.CanExecute(null));
+    }
+
+    private sealed class StubBillingApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public List<string> Paths { get; } = new();
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+
+            if (typeof(T) == typeof(List<BillingQuerySummaryDto>))
+            {
+                var data = new List<BillingQuerySummaryDto>
+                {
+                    new()
+                    {
+                        Id = 11,
+                        ActivityCode = "dev",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-1",
+                        Status = QueryStatus.Inserted,
+                        Description = "Rendez-vous #1",
+                        Reason = "Point de cadrage",
+                        EventDate = new DateTime(2026, 9, 1, 10, 0, 0, DateTimeKind.Utc),
+                    },
+                    new()
+                    {
+                        Id = 12,
+                        ActivityCode = "other",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-1",
+                        Status = QueryStatus.Accepted,
+                        Description = "Autre activité",
+                        EventDate = new DateTime(2026, 9, 2, 10, 0, 0, DateTimeKind.Utc),
+                    },
+                    new()
+                    {
+                        Id = 13,
+                        ActivityCode = "dev",
+                        PerformerId = "perf-2",
+                        ClientId = "cli-1",
+                        Status = QueryStatus.Accepted,
+                        Description = "Autre performer",
+                        EventDate = new DateTime(2026, 9, 3, 10, 0, 0, DateTimeKind.Utc),
+                    },
+                    new()
+                    {
+                        Id = 14,
+                        ActivityCode = "dev",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-1",
+                        Status = QueryStatus.InProgress,
+                        Description = "En cours",
+                        EventDate = new DateTime(2026, 9, 4, 10, 0, 0, DateTimeKind.Utc),
+                    },
+                    new()
+                    {
+                        Id = 15,
+                        ActivityCode = "dev",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-1",
+                        Status = QueryStatus.Rejected,
+                        Description = "Rejetée",
+                        EventDate = new DateTime(2026, 9, 5, 10, 0, 0, DateTimeKind.Utc),
+                    }
+                };
+
+                return Task.FromResult((T)(object)data);
+            }
+
+            return Task.FromResult(default(T)!);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+            return Task.CompletedTask;
+        }
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/PostAclDialogTests.cs

@@ -95,7 +95,7 @@ public class PostAclDialogTests
             HttpMethod method, string path, object? body = null,
             CancellationToken ct = default)
         {
-            var absolute = new Uri(new Uri(Settings.BusinessApiUrl), path);
+            var absolute = new Uri(new Uri(Settings.ApiUrl), path);
             using var req = new HttpRequestMessage(method, absolute);
             using var resp = _http.SendAsync(req, ct).GetAwaiter().GetResult();
             resp.EnsureSuccessStatusCode();
@@ -123,8 +123,8 @@ public class PostAclDialogTests
         var handler = new CountingHttpHandler();
         var settings = new Settings();
         var api = new TestableYavscApiClient(settings, new TokenStore(System.IO.Path.GetTempFileName()), handler);
-        var aclClient = new BlogAclApiClient(api, settings.BusinessApiUrl);
-        var circleClient = new CircleApiClient(api, settings.BusinessApiUrl);
+        var aclClient = new BlogAclApiClient(api, settings.ApiUrl);
+        var circleClient = new CircleApiClient(api, settings.ApiUrl);
 
         var services = new ServiceCollection();
         services.AddSingleton(settings);

src/PostIt/PostIt.Tests/SettingsLoadTests.cs

@@ -89,7 +89,7 @@ public class SettingsLoadTests
                         settings.Authentication.RedirectUri =
                             global::AuthenticationSettings.DesktopRedirectUri;
 
-                        settings.BusinessApiUrl = flip
+                        settings.ApiUrl = flip
                             ? "https://a.example.test/api/v1/"
                             : "https://b.example.test/api/v1/";
 

src/PostIt/PostIt.Tests/SignaturePadControlTests.cs

@@ -94,6 +94,26 @@ public class SignaturePadControlTests
         Assert.NotEqual(first.Strokes, third.Strokes);
     }
 
+    [Fact]
+    public void PendingStroke_is_exposed_only_while_capturing()
+    {
+        var pad = new SignaturePadControl();
+
+        Assert.Empty(pad.PendingStroke);
+
+        pad.BeginCaptureForTest();
+        pad.AppendPointForTest(1_000, 2_000);
+        pad.AppendPointForTest(3_000, 4_000);
+
+        Assert.Equal(new[] { 1_000, 2_000, 3_000, 4_000 }, pad.PendingStroke);
+        Assert.Equal(new[] { 1_000, 2_000, 3_000, 4_000 }, pad.Strokes);
+
+        pad.SealStrokeForTest();
+
+        Assert.Empty(pad.PendingStroke);
+        Assert.Equal(new[] { 2, 1_000, 2_000, 3_000, 4_000 }, pad.Strokes);
+    }
+
     [Fact]
     public void Clear_empties_buffer_and_raises_redraw()
     {

src/PostIt/PostIt.Tests/YavscApiClientTests.cs

@@ -58,7 +58,7 @@ public class YavscApiClientTests
             // calls CallAsync("posts", ...) directly (bypassing
             // BlogApiClient, which is the only thing that would set
             // it in production). Mirror prod here.
-            reloaded.Http.BaseAddress = new Uri(settings.BusinessApiUrl);
+            reloaded.Http.BaseAddress = new Uri(settings.ApiUrl);
 
             var posts = await reloaded.CallAsync<List<StubApiServer.Post>>(
                 HttpMethod.Get, "posts", TestContext.Current.CancellationToken);
@@ -118,7 +118,7 @@ public class YavscApiClientTests
                 RedirectUri = "postit://callback",
                 Scopes = new[] { "openid" },
             },
-            BusinessApiUrl = "https://127.0.0.1:5003/api/v1",
+            ApiUrl = "https://127.0.0.1:5003/api/v1",
         };
         var client = new YavscApiClient(settings, new TokenStore(Path.Combine(
             Path.GetTempPath(), $"postit-tests-noop-{Guid.NewGuid():N}.json")));
@@ -162,7 +162,7 @@ public class YavscApiClientTests
             RedirectUri = authority.LoopbackRedirectUri,
             Scopes = new[] { "openid", "profile", "blog" }
         },
-        BusinessApiUrl = apiBaseUrl
+        ApiUrl = apiBaseUrl
     };
 
     private static async Task<YavscApiClient> LoginAndPersistAsync(
@@ -175,7 +175,7 @@ public class YavscApiClientTests
         // directly (bypassing BlogApiClient) rely on the same
         // BaseAddress the production chain sets in BlogApiClient's
         // ctor. Mirror that here so "posts" resolves to the stub.
-        client.Http.BaseAddress = new Uri(settings.BusinessApiUrl);
+        client.Http.BaseAddress = new Uri(settings.ApiUrl);
 
         // Force the API client to use the test browser by routing the
         // LoginInteractiveAsync call through a small wrapper.

src/PostIt/PostIt/App.axaml.cs

@@ -86,11 +86,6 @@ private void ConfigureRootView(MainView rootView)
         rootView.NavRoot.PopToRootAsync();
     };
 
-    sessionStatus.LoginSucceeded += async () =>
-    {
-        await PushMainPageAsync();
-    };
-
     rootView.SessionBanner.DataContext = sessionStatus;
 }
 
@@ -140,9 +135,6 @@ private void ConfigureRootView(MainView rootView)
         var homePage = provider.GetRequiredService<HomePageViewModel>();
         var app = (App)Current!;
         await app.PushPageAsync(homePage);
-        if (!refreshed) return;
-
-        await PushMainPageAsync().ConfigureAwait(true);
     }
 
     /// <summary>
@@ -153,7 +145,7 @@ private void ConfigureRootView(MainView rootView)
     /// (interactive login from the banner). Pulled out as a helper so
     /// the two callers can't drift apart.
     /// </summary>
-    public static async Task PushMainPageAsync()
+    public static async Task PushBlogsPageAsync()
     {
         var app = (App)Current!;
         var mainVm = app.ServiceProvider!.GetRequiredService<MainViewModel>();

src/PostIt/PostIt/Controls/SignaturePadControl.cs

@@ -68,21 +68,38 @@ public class SignaturePadControl : TemplatedControl
     public event EventHandler? RedrawRequested;
 
     private readonly List<int> _strokes = new(capacity: 256);
+    private InputElement? _wiredCaptureArea;
     private int _pendingPoints; // number of (x, y) pairs awaiting a length prefix
     private bool _capturing;
 
     protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
     {
         base.OnApplyTemplate(e);
+        RewireCaptureArea();
+    }
 
-        if (CaptureArea is { } previous)
+    protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+    {
+        base.OnPropertyChanged(change);
+
+        if (change.Property == CaptureAreaProperty)
+        {
+            RewireCaptureArea();
+        }
+    }
+
+    private void RewireCaptureArea()
+    {
+        if (_wiredCaptureArea is { } previous)
         {
             previous.PointerPressed -= OnCapturePressed;
             previous.PointerMoved -= OnCaptureMoved;
             previous.PointerReleased -= OnCaptureReleased;
         }
 
-        if (CaptureArea is { } area)
+        _wiredCaptureArea = CaptureArea;
+
+        if (_wiredCaptureArea is { } area)
         {
             area.PointerPressed += OnCapturePressed;
             area.PointerMoved += OnCaptureMoved;
@@ -97,12 +114,14 @@ public class SignaturePadControl : TemplatedControl
         _capturing = true;
         _pendingPoints = 0;
         AppendPoint(e.GetPosition(CaptureArea));
+        RedrawRequested?.Invoke(this, EventArgs.Empty);
     }
 
     private void OnCaptureMoved(object? sender, PointerEventArgs e)
     {
         if (!_capturing) return;
         AppendPoint(e.GetPosition(CaptureArea));
+        RedrawRequested?.Invoke(this, EventArgs.Empty);
     }
 
     private void OnCaptureReleased(object? sender, PointerReleasedEventArgs e)
@@ -169,6 +188,16 @@ public class SignaturePadControl : TemplatedControl
     /// </summary>
     public SignaturePadData Snapshot() => new(_strokes.ToArray());
 
+    /// <summary>
+    /// Copy of the current in-progress stroke, without the length
+    /// prefix used for sealed strokes. The view can render this as a
+    /// live preview while the user is still drawing.
+    /// </summary>
+    internal IReadOnlyList<int> PendingStroke
+        => _capturing && _pendingPoints > 0
+            ? _strokes.GetRange(_strokes.Count - 2 * _pendingPoints, 2 * _pendingPoints)
+            : Array.Empty<int>();
+
     // --- Test-only surface (visible to PostIt.Tests) -------------------
 
     /// <summary>
@@ -183,6 +212,17 @@ public class SignaturePadControl : TemplatedControl
         _pendingPoints++;
     }
 
+    /// <summary>
+    /// Test hook: mark the control as actively capturing so tests
+    /// can exercise the live-preview path without synthetic pointer
+    /// events.
+    /// </summary>
+    internal void BeginCaptureForTest()
+    {
+        _capturing = true;
+        _pendingPoints = 0;
+    }
+
     /// <summary>
     /// Test hook: seal the currently-pending stroke with a length
     /// prefix. Mirrors what <see cref="OnCaptureReleased"/> does at

src/PostIt/PostIt/Helpers/FormHelpers.cs

@@ -0,0 +1,50 @@
+using System;
+using PostIt.ViewModels;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+
+namespace PostIt.Helpers;
+
+public static class FormHelpers
+{
+    public static BillingCommandPageViewModel?
+    CreateCommandPageViewModel(
+        this CommandFormSummary form,
+        ActivityInfo activity,
+        ActivityUserDisplayItem performer,
+        BillingApiClient billingClient)
+    {
+
+        string namespacePrefix = typeof(PostIt.ViewModels.Commands.RdvViewModel).Namespace + ".";
+
+        string formVMName =   form.ActionName + "ViewModel";
+
+        string formOnActivityVMName =  activity.Code + formVMName + "ViewModel";
+
+        var vmType = Type.GetType(namespacePrefix +formOnActivityVMName);
+        if (vmType == null)
+        {
+            vmType = Type.GetType(namespacePrefix + formVMName);
+        }
+        if (vmType == null)
+        {
+            Console.Error.WriteLine(
+                $"! Cannot find type '{formOnActivityVMName}' or '{formVMName}'");
+            return null;
+        }
+        if (!typeof(BillingCommandPageViewModel).IsAssignableFrom(vmType))
+        {
+            Console.Error.WriteLine($"! The type '{formOnActivityVMName}' or '{formVMName}' is not a BillingCommandPageViewModel");
+            return null;
+        }
+
+        var vm = Activator.CreateInstance(vmType, activity, performer, form, billingClient);
+
+        if (vm == null)
+        {
+            throw new InvalidOperationException($"Cannot create instance of '{formOnActivityVMName}' or '{formVMName}'");
+        }
+
+        return vm as BillingCommandPageViewModel ?? throw new InvalidOperationException($"The type '{formOnActivityVMName}' or '{formVMName}' is not a BillingCommandPageViewModel");
+    }
+}

src/PostIt/PostIt/Helpers/ImageHelper.cs

@@ -0,0 +1,34 @@
+using System;
+using System.IO;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Avalonia.Media.Imaging;
+using Avalonia.Platform;
+
+namespace PostIt.Helpers;
+
+public static class ImageHelper
+{
+    private static readonly HttpClient HttpClient = new();
+
+    public static Bitmap LoadFromResource(Uri resourceUri)
+    {
+        return new Bitmap(AssetLoader.Open(resourceUri));
+    }
+
+    public static async Task<Bitmap?> LoadFromWeb(Uri url)
+    {
+        try
+        {
+            var response = await HttpClient.GetAsync(url).ConfigureAwait(false);
+            response.EnsureSuccessStatusCode();
+            var data = await response.Content.ReadAsByteArrayAsync().ConfigureAwait(false);
+            return new Bitmap(new MemoryStream(data));
+        }
+        catch (HttpRequestException ex)
+        {
+            Console.WriteLine($"An error occurred while downloading image '{url}': {ex.Message}");
+            return null;
+        }
+    }
+}

src/PostIt/PostIt/Helpers/ServiceCollectionHelpers.cs

@@ -3,6 +3,7 @@ using Microsoft.Extensions.DependencyInjection;
 using PostIt.Services;
 using PostIt.ViewModels;
 using PostIt.Views;
+using PostIt.Views.Commands;
 using Yavsc.Api.Client;
 
 namespace PostIt.Helpers;
@@ -23,6 +24,11 @@ public static class ServiceCollectionHelpers
         var circleClient = new CircleApiClient(api, settings.BlogsApiUrl);
         var blogAclClient = new BlogAclApiClient(api, settings.BlogsApiUrl);
         var userSearchClient = new UserSearchClient(api, settings.BlogsApiUrl);
+        var activityClient = new ActivityApiClient(
+            api,
+            settings.ApiUrl,
+            settings.Authentication?.Authority);
+        var billingClient = new BillingApiClient(api, settings.ApiUrl);
         var userDirectory = new UserDirectory(userSearchClient);
 
         // Vues
@@ -45,6 +51,11 @@ public static class ServiceCollectionHelpers
         services.AddSingleton<HomePage>();
         services.AddSingleton<SignaturePage>();
         services.AddSingleton<CirclesPage>();
+        services.AddSingleton<ActivitiesPage>();
+        services.AddTransient<CommandFormsPage>();
+        services.AddTransient<RdvPage>();
+        services.AddTransient<BrushPage>();
+        services.AddTransient<BillingQueriesPage>();
         // ViewModels
         services.AddSingleton(settings);
         services.AddSingleton<YavscApiClient>(api);
@@ -52,10 +63,14 @@ public static class ServiceCollectionHelpers
         services.AddSingleton(circleClient);
         services.AddSingleton(blogAclClient);
         services.AddSingleton(userSearchClient);
+        services.AddSingleton(activityClient);
+        services.AddSingleton(billingClient);
         services.AddSingleton<IUserDirectory>(userDirectory);
         services.AddSingleton<HomePageViewModel>();
         services.AddSingleton<SignaturePageViewModel>();
         services.AddSingleton<CirclesPageViewModel>();
+        services.AddSingleton<ActivitiesPageViewModel>();
+        services.AddTransient<SelectableHairPrestationItem>();
 
         // Dialogs (modal-light pages): the ViewLocator resolves
         // them when a caller pushes a PostAclDialogViewModel or

src/PostIt/PostIt/Services/CurrentLocationResult.cs

@@ -0,0 +1,28 @@
+namespace PostIt.Services;
+
+public sealed class CurrentLocationResult
+{
+    private CurrentLocationResult(bool isSuccess, bool isPermissionDenied, double? latitude, double? longitude, string message)
+    {
+        IsSuccess = isSuccess;
+        IsPermissionDenied = isPermissionDenied;
+        Latitude = latitude;
+        Longitude = longitude;
+        Message = message;
+    }
+
+    public bool IsSuccess { get; }
+    public bool IsPermissionDenied { get; }
+    public double? Latitude { get; }
+    public double? Longitude { get; }
+    public string Message { get; }
+
+    public static CurrentLocationResult Success(double latitude, double longitude, string? message = null)
+        => new(true, false, latitude, longitude, message ?? "Position récupérée.");
+
+    public static CurrentLocationResult PermissionDenied(string? message = null)
+        => new(false, true, null, null, message ?? "La géolocalisation n'est pas autorisée.");
+
+    public static CurrentLocationResult Unavailable(string? message = null)
+        => new(false, false, null, null, message ?? "La géolocalisation n'est pas disponible sur cette plateforme.");
+}

src/PostIt/PostIt/Services/Platform.cs

@@ -1,4 +1,7 @@
+using System;
 using IdentityModel.OidcClient.Browser;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace PostIt.Services;
 
@@ -37,4 +40,12 @@ public static class Platform
     /// </summary>
     public static System.Func<IBrowser?>? CreateBrowser { get; set; } =
         () => new CustomSchemeBrowser(CustomScheme);
+
+    /// <summary>
+    /// Optional platform hook used by the shared billing form to request a
+    /// current device position. Platforms that do not expose a native
+    /// location provider can leave the default delegate in place.
+    /// </summary>
+    public static Func<CancellationToken, Task<CurrentLocationResult>> TryGetCurrentLocationAsync { get; set; } =
+        _ => Task.FromResult(CurrentLocationResult.Unavailable());
 }

src/PostIt/PostIt/Services/YavscApiClient.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
@@ -351,6 +352,77 @@ public class YavscApiClient : IYavscApiClient, IAsyncDisposable
         _store.Save(_tokens);
     }
 
+    /// <summary>
+    /// Upload a user avatar to the Yavsc API. The server expects a
+    /// single multipart file named <c>file</c> and validates the image
+    /// content type before persisting it.
+    /// </summary>
+    public async Task<string> SetAvatarAsync(
+        Stream imageStream,
+        string fileName,
+        string? contentType = null,
+        CancellationToken ct = default)
+    {
+        if (imageStream is null)
+            throw new ArgumentNullException(nameof(imageStream));
+        if (string.IsNullOrWhiteSpace(fileName))
+            throw new ArgumentException("A file name is required.", nameof(fileName));
+
+        var endpoint = new Uri(new Uri(Settings.ApiUrl.TrimEnd('/') + "/", UriKind.Absolute), "account/set-avatar");
+
+        await EnsureFreshTokenAsync(ct).ConfigureAwait(false);
+
+        var attemptUpload = async () =>
+        {
+            if (imageStream.CanSeek)
+                imageStream.Position = 0;
+
+            using var content = new MultipartFormDataContent();
+            using var fileContent = new StreamContent(imageStream);
+            fileContent.Headers.ContentType = new MediaTypeHeaderValue(
+                string.IsNullOrWhiteSpace(contentType) ? "application/octet-stream" : contentType);
+            content.Add(fileContent, "file", fileName);
+
+            using var request = new HttpRequestMessage(HttpMethod.Post, endpoint)
+            {
+                Content = content,
+            };
+
+            return await Http.SendAsync(request, ct).ConfigureAwait(false);
+        };
+
+        var response = await attemptUpload().ConfigureAwait(false);
+        if (response.StatusCode == HttpStatusCode.Unauthorized)
+        {
+            response.Dispose();
+            await ForceRefreshAsync(ct).ConfigureAwait(false);
+            response = await attemptUpload().ConfigureAwait(false);
+        }
+
+        await EnsureSuccessOrThrowAsync(response, ct).ConfigureAwait(false);
+
+        var payload = await response.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
+        if (string.IsNullOrWhiteSpace(payload))
+            return "Avatar mis à jour.";
+
+        try
+        {
+            using var json = JsonDocument.Parse(payload);
+            if (json.RootElement.TryGetProperty("message", out var msgEl))
+            {
+                var message = msgEl.GetString();
+                if (!string.IsNullOrWhiteSpace(message))
+                    return message;
+            }
+        }
+        catch (JsonException)
+        {
+            // Keep a user-friendly fallback when the API payload is not JSON.
+        }
+
+        return "Avatar mis à jour.";
+    }
+
     public async Task LogoutAsync()
     {
         _store.Clear();

src/PostIt/PostIt/ViewLocator.cs

@@ -4,7 +4,9 @@ using Avalonia.Controls;
 using Avalonia.Controls.Templates;
 using Microsoft.Extensions.DependencyInjection;
 using PostIt.ViewModels;
+using PostIt.ViewModels.Commands;
 using PostIt.Views;
+using PostIt.Views.Commands;
 
 namespace PostIt;
 
@@ -39,6 +41,10 @@ public class ViewLocator : IDataTemplate
             MainViewModel => services.GetRequiredService<MainPage>(),
             Settings => services.GetRequiredService<SettingsPage>(),
             HomePageViewModel => services.GetRequiredService<HomePage>(),
+            ActivitiesPageViewModel => services.GetRequiredService<ActivitiesPage>(),
+            CommandFormsPageViewModel => services.GetRequiredService<CommandFormsPage>(),
+            BrushViewModel => services.GetRequiredService<BrushPage>(),
+            RdvViewModel => services.GetRequiredService<RdvPage>(),
             SignaturePageViewModel => services.GetRequiredService<SignaturePage>(),
             AddCircleMemberDialogViewModel => services.GetRequiredService<AddCircleMemberDialog>(),
             CirclesPageViewModel => services.GetRequiredService<CirclesPage>(),

src/PostIt/PostIt/ViewModels/ActivitiesPageViewModel.cs

@@ -0,0 +1,275 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PostIt.Helpers;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+
+namespace PostIt.ViewModels;
+
+public partial class ActivitiesPageViewModel : ViewModelBase
+{
+    private readonly ActivityApiClient _client;
+    private readonly BillingApiClient _billingClient;
+    private bool _syncingSelection;
+
+    [ObservableProperty]
+    public partial ObservableCollection<ActivityInfo> Activities { get; set; } = new();
+
+    [ObservableProperty]
+    public partial ActivityInfo? SelectedActivity { get; set; }
+
+    [ObservableProperty]
+    public partial ObservableCollection<ActivityInfo> Specializations { get; set; } = new();
+
+    [ObservableProperty]
+    public partial ActivityInfo? SelectedSpecialization { get; set; }
+
+    [ObservableProperty]
+    public partial ObservableCollection<ActivityUserDisplayItem> Performers { get; set; } = new();
+
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(OpenCommandFormsCommand))]
+    public partial ActivityUserDisplayItem? SelectedPerformer { get; set; }
+
+    [ObservableProperty]
+    public partial bool IsBusy { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; } = "Choisissez une activité.";
+
+    public ActivityInfo? CurrentActivity => SelectedSpecialization ?? SelectedActivity;
+    public string SelectedActivityLabel => SelectedActivity?.Name ?? "(aucune activité)";
+    public string CurrentActivityLabel => CurrentActivity?.Name ?? "(aucune)";
+    public int CurrentFormCount => CurrentActivity?.Forms?.Count ?? 0;
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public ActivitiesPageViewModel(ActivityApiClient client, BillingApiClient billingClient)
+    {
+        _client = client ?? throw new ArgumentNullException(nameof(client));
+        _billingClient = billingClient ?? throw new ArgumentNullException(nameof(billingClient));
+    }
+
+    partial void OnSelectedActivityChanged(ActivityInfo? value)
+    {
+        if (_syncingSelection) return;
+        _ = ShowActivitySafeAsync(value);
+    }
+
+    partial void OnSelectedSpecializationChanged(ActivityInfo? value)
+    {
+        if (_syncingSelection) return;
+        _ = ShowSpecializationSafeAsync(value);
+    }
+
+    private async Task ShowActivitySafeAsync(ActivityInfo? value)
+    {
+        try
+        {
+            await ShowActivityAsync(value);
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            StatusMessage = "Accès refusé pour les activités (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Erreur: {ex.Message}";
+        }
+    }
+
+    private async Task ShowSpecializationSafeAsync(ActivityInfo? value)
+    {
+        try
+        {
+            await ShowSpecializationAsync(value);
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            StatusMessage = "Accès refusé pour les activités (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Erreur: {ex.Message}";
+        }
+    }
+
+    [RelayCommand]
+    public async Task RefreshAsync()
+    {
+        IsBusy = true;
+        try
+        {
+            var list = await _client.GetCatalogAsync();
+            Activities = new ObservableCollection<ActivityInfo>(list ?? new());
+
+            var first = Activities.FirstOrDefault();
+            await ShowActivityAsync(first);
+            if (first is null)
+            {
+                StatusMessage = "Aucune activité disponible.";
+            }
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            Activities = new ObservableCollection<ActivityInfo>();
+            Specializations = new ObservableCollection<ActivityInfo>();
+            Performers = new ObservableCollection<ActivityUserDisplayItem>();
+            StatusMessage = "Accès refusé pour les activités (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            Activities = new ObservableCollection<ActivityInfo>();
+            Specializations = new ObservableCollection<ActivityInfo>();
+            Performers = new ObservableCollection<ActivityUserDisplayItem>();
+            StatusMessage = $"Erreur: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    public async Task ShowActivityAsync(ActivityInfo? activity)
+    {
+        _syncingSelection = true;
+        try
+        {
+            SelectedActivity = activity;
+            SelectedSpecialization = null;
+        }
+        finally
+        {
+            _syncingSelection = false;
+        }
+
+        OnPropertyChanged(nameof(CurrentActivity));
+        OnPropertyChanged(nameof(SelectedActivityLabel));
+        OnPropertyChanged(nameof(CurrentActivityLabel));
+        OnPropertyChanged(nameof(CurrentFormCount));
+        Specializations = new ObservableCollection<ActivityInfo>(activity?.Children ?? new());
+
+        if (activity is null)
+        {
+            Performers = new ObservableCollection<ActivityUserDisplayItem>();
+            SelectedPerformer = null;
+            return;
+        }
+
+        await LoadPerformersAsync(activity);
+    }
+
+    public async Task ShowSpecializationAsync(ActivityInfo? specialization)
+    {
+        _syncingSelection = true;
+        try
+        {
+            SelectedSpecialization = specialization;
+        }
+        finally
+        {
+            _syncingSelection = false;
+        }
+
+        OnPropertyChanged(nameof(CurrentActivity));
+        OnPropertyChanged(nameof(CurrentActivityLabel));
+        OnPropertyChanged(nameof(CurrentFormCount));
+
+        if (specialization is null)
+        {
+            if (SelectedActivity is not null)
+            {
+                await LoadPerformersAsync(SelectedActivity);
+            }
+            return;
+        }
+
+        await LoadPerformersAsync(specialization);
+    }
+
+    private async Task LoadPerformersAsync(ActivityInfo activity)
+    {
+        IsBusy = true;
+        try
+        {
+            var list = await _client.GetUsersAsync(activity.Code);
+            var items = (list ?? new())
+                .Select(dto => ActivityUserDisplayItem.FromDto(dto, _client.BuildAvatarXsUrl(dto.UserName)))
+                .ToList();
+
+            await Task.WhenAll(items.Select(async item =>
+            {
+                if (string.IsNullOrWhiteSpace(item.AvatarXsUrl))
+                {
+                    return;
+                }
+
+                if (!Uri.TryCreate(item.AvatarXsUrl, UriKind.Absolute, out var avatarUri))
+                {
+                    return;
+                }
+
+                item.AvatarImage = await ImageHelper.LoadFromWeb(avatarUri);
+            }));
+
+            Performers = new ObservableCollection<ActivityUserDisplayItem>(items);
+            SelectedPerformer = null;
+            StatusMessage = $"{activity.Name} · {Performers.Count} utilisateur(s)";
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            Performers = new ObservableCollection<ActivityUserDisplayItem>();
+            SelectedPerformer = null;
+            StatusMessage = "Accès refusé pour les activités (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            Performers = new ObservableCollection<ActivityUserDisplayItem>();
+            SelectedPerformer = null;
+            StatusMessage = $"Erreur: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+            OpenCommandFormsCommand.NotifyCanExecuteChanged();
+        }
+    }
+
+    private bool CanOpenCommandForms()
+        => SelectedPerformer is not null && CurrentActivity?.Forms?.Count > 0;
+
+    [RelayCommand(CanExecute = nameof(CanOpenCommandForms))]
+    private async Task OpenCommandFormsAsync()
+    {
+        if (SelectedPerformer is null || CurrentActivity is null)
+        {
+            StatusMessage = "Sélectionnez un utilisateur et une activité avec formulaire.";
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var vm = new CommandFormsPageViewModel(CurrentActivity, SelectedPerformer, _billingClient);
+        await app.PushPageAsync(vm);
+    }
+}

src/PostIt/PostIt/ViewModels/ActivityUserDisplayItem.cs

@@ -0,0 +1,50 @@
+using Avalonia.Media.Imaging;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Yavsc.Abstract.Workflow;
+
+namespace PostIt.ViewModels;
+
+public sealed partial class ActivityUserDisplayItem : ObservableObject
+{
+    public string PerformerId { get; init; } = string.Empty;
+    public string AvatarXsUrl { get; init; } = string.Empty;
+    public bool HasPerformerProfile { get; init; }
+    public string PerformerBadgeLabel { get; init; } = "Profil pro";
+    public bool IsPerformerActive { get; init; }
+    public string PerformerStatusBadgeLabel { get; init; } = "Inactif";
+    public string PerformerStatusBadgeBackground { get; init; } = "#FDECEA";
+    public string PerformerStatusBadgeBorder { get; init; } = "#C62828";
+    public string PerformerStatusBadgeForeground { get; init; } = "#8E0000";
+    public string UserName { get; init; } = string.Empty;
+    public string AvatarFallbackLabel { get; init; } = "?";
+    public string WebSite { get; init; } = string.Empty;
+    public int ExtraActivityCount { get; init; }
+    public string ExtraActivityLabel { get; init; } = "Pas d'autre activité";
+
+    [ObservableProperty]
+    public partial Bitmap? AvatarImage { get; set; }
+
+    public static ActivityUserDisplayItem FromDto(PerformerActivity dto, string avatarXsUrl)
+    {
+        return new ActivityUserDisplayItem
+        {
+            PerformerId = dto.PerformerId,
+            AvatarXsUrl = avatarXsUrl,
+            HasPerformerProfile = dto.HasPerformerProfile,
+            UserName = dto.UserName,
+            AvatarFallbackLabel = string.IsNullOrWhiteSpace(dto.UserName)
+                ? "?"
+                : dto.UserName.Trim()[0].ToString().ToUpperInvariant(),
+            WebSite = dto.WebSite,
+            IsPerformerActive = dto.Active,
+            PerformerStatusBadgeLabel = dto.Active ? "Actif" : "Inactif",
+            PerformerStatusBadgeBackground = dto.Active ? "#E6F7EC" : "#FDECEA",
+            PerformerStatusBadgeBorder = dto.Active ? "#2E7D32" : "#C62828",
+            PerformerStatusBadgeForeground = dto.Active ? "#1B5E20" : "#8E0000",
+            ExtraActivityCount = dto.ExtraActivityCount,
+            ExtraActivityLabel = dto.ExtraActivityCount == 0
+                ? "Pas d'autre activité"
+                : $"Autres spécialisations: {dto.ExtraActivityCount}"
+        };
+    }
+}

src/PostIt/PostIt/ViewModels/BillingQueriesPageViewModel.cs

@@ -0,0 +1,173 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PostIt.Helpers;
+using Yavsc;
+using Yavsc.Api.Client;
+using Yavsc.Abstract.Workflow;
+
+namespace PostIt.ViewModels;
+
+public partial class BillingQueriesPageViewModel : ViewModelBase
+{
+    private readonly BillingApiClient _billingClient;
+
+    public ActivityInfo Activity { get; }
+    public ActivityUserDisplayItem Performer { get; }
+    public CommandFormSummary Form { get; }
+    public bool IsReadOnly { get; }
+    public bool OngoingOnly { get; }
+
+    [ObservableProperty]
+    public partial ObservableCollection<BillingQueryDisplayItem> Queries { get; set; } = new();
+
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(OpenSelectedQueryCommand))]
+    public partial BillingQueryDisplayItem? SelectedQuery { get; set; }
+
+    [ObservableProperty]
+    public partial bool IsBusy { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; } = "Chargement des commandes...";
+
+    public string Title => IsReadOnly
+        ? $"Demandes en cours ({Form.Title})"
+        : $"Commandes {Form.Title}";
+    public string ContextLabel => $"{Performer.UserName} · {Activity.Name}";
+    public bool CanOpenDetails => !IsReadOnly;
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public BillingQueriesPageViewModel(
+        ActivityInfo activity,
+        ActivityUserDisplayItem performer,
+        CommandFormSummary form,
+        BillingApiClient billingClient,
+        bool isReadOnly = false,
+        bool ongoingOnly = false)
+    {
+        Activity = activity ?? throw new ArgumentNullException(nameof(activity));
+        Performer = performer ?? throw new ArgumentNullException(nameof(performer));
+        Form = form ?? throw new ArgumentNullException(nameof(form));
+        _billingClient = billingClient ?? throw new ArgumentNullException(nameof(billingClient));
+        IsReadOnly = isReadOnly;
+        OngoingOnly = ongoingOnly;
+    }
+
+    public Task InitializeAsync() => RefreshAsync();
+
+    private bool CanOpenSelectedQuery() => !IsReadOnly && SelectedQuery is not null;
+
+    [RelayCommand]
+    public async Task RefreshAsync()
+    {
+        IsBusy = true;
+        try
+        {
+            var list = await _billingClient.GetQuerySummariesAsync(Form.ActionName).ConfigureAwait(true);
+            var filtered = (list ?? new())
+                .Where(q => q.ActivityCode == Activity.Code && q.PerformerId == Performer.PerformerId)
+                .Where(q => !OngoingOnly || IsOngoingStatus(q.Status))
+                .OrderByDescending(q => q.EventDate ?? DateTime.MinValue)
+                .ThenByDescending(q => q.Id)
+                .Select(BillingQueryDisplayItem.FromDto)
+                .ToList();
+
+            Queries = new ObservableCollection<BillingQueryDisplayItem>(filtered);
+            StatusMessage = BuildLoadedStatusMessage(filtered.Count);
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            Queries = new ObservableCollection<BillingQueryDisplayItem>();
+            StatusMessage = "Accès refusé au billing (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            Queries = new ObservableCollection<BillingQueryDisplayItem>();
+            StatusMessage = $"Erreur: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    [RelayCommand(CanExecute = nameof(CanOpenSelectedQuery))]
+    public async Task OpenSelectedQueryAsync()
+    {
+        if (IsReadOnly)
+        {
+            StatusMessage = "Mode lecture seule: l'ouverture en modification est désactivée.";
+            return;
+        }
+
+        if (SelectedQuery is null)
+        {
+            StatusMessage = "Sélectionnez une commande.";
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        IsBusy = true;
+        try
+        {
+            var details = await _billingClient.GetQueryAsync(Form.ActionName, SelectedQuery.Id).ConfigureAwait(true);
+            var vm = Form.CreateCommandPageViewModel(Activity, Performer, _billingClient);
+            await vm!.InitializeAsync(details).ConfigureAwait(true);
+            await app.PushPageAsync(vm).ConfigureAwait(true);
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            StatusMessage = "Accès refusé au billing (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Erreur lors de l'ouverture: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    private string BuildLoadedStatusMessage(int count)
+    {
+        if (count == 0)
+        {
+            return OngoingOnly
+                ? "Aucune demande en cours pour ce formulaire."
+                : "Aucune commande trouvée pour ce formulaire.";
+        }
+
+        if (OngoingOnly)
+        {
+            return $"{count} demande(s) en cours chargée(s) (lecture seule).";
+        }
+
+        return $"{count} commande(s) chargée(s).";
+    }
+
+    private static bool IsOngoingStatus(QueryStatus status)
+        => status is QueryStatus.Inserted or QueryStatus.Accepted or QueryStatus.InProgress;
+}

src/PostIt/PostIt/ViewModels/BillingQueryDisplayItem.cs

@@ -0,0 +1,35 @@
+using System;
+using Yavsc.Api.Client;
+
+namespace PostIt.ViewModels;
+
+public sealed class BillingQueryDisplayItem
+{
+    public long Id { get; init; }
+    public string Description { get; init; } = string.Empty;
+    public string Summary { get; init; } = string.Empty;
+    public string StatusLabel { get; init; } = string.Empty;
+    public string EventDateLabel { get; init; } = string.Empty;
+    public string BillingCode { get; init; } = string.Empty;
+
+    public static BillingQueryDisplayItem FromDto(BillingQuerySummaryDto dto)
+    {
+        var summary = !string.IsNullOrWhiteSpace(dto.Reason)
+            ? dto.Reason
+            : !string.IsNullOrWhiteSpace(dto.AdditionalInfo)
+                ? dto.AdditionalInfo
+                : dto.Description;
+
+        return new BillingQueryDisplayItem
+        {
+            Id = dto.Id,
+            Description = string.IsNullOrWhiteSpace(dto.Description)
+                ? $"Commande #{dto.Id}"
+                : dto.Description,
+            Summary = summary,
+            StatusLabel = dto.Status.ToString(),
+            EventDateLabel = dto.EventDate?.ToLocalTime().ToString("g") ?? "Date non précisée",
+            BillingCode = dto.BillingCode,
+        };
+    }
+}

src/PostIt/PostIt/ViewModels/CommandFormsPageViewModel.cs

@@ -0,0 +1,135 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PostIt.Helpers;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+
+namespace PostIt.ViewModels;
+
+public partial class CommandFormsPageViewModel : ViewModelBase
+{
+    private readonly BillingApiClient _billingClient;
+
+    public ActivityInfo Activity { get; }
+    public ActivityUserDisplayItem Performer { get; }
+
+    [ObservableProperty]
+    public partial ObservableCollection<CommandFormSummary> Forms { get; set; }
+
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(OpenSelectedFormCommand)), NotifyCanExecuteChangedFor(nameof(OpenQueriesCommand)), NotifyCanExecuteChangedFor(nameof(OpenOngoingQueriesCommand))]
+    public partial CommandFormSummary? SelectedForm { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; }
+
+    public string Title => $"Formulaires pour {Performer.UserName}";
+    public string ContextLabel => $"{Activity.Name} · {Forms.Count} formulaire(s)";
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public CommandFormsPageViewModel(
+        ActivityInfo activity,
+        ActivityUserDisplayItem performer,
+        BillingApiClient billingClient)
+    {
+        Activity = activity ?? throw new ArgumentNullException(nameof(activity));
+        Performer = performer ?? throw new ArgumentNullException(nameof(performer));
+        _billingClient = billingClient ?? throw new ArgumentNullException(nameof(billingClient));
+
+        Forms = new ObservableCollection<CommandFormSummary>((activity.Forms ?? new())
+            .OrderBy(f => f.Title)
+            .ThenBy(f => f.ActionName));
+        SelectedForm = Forms.FirstOrDefault();
+        StatusMessage = Forms.Count == 0
+            ? "Aucun formulaire n'est disponible pour cette activité."
+            : "Choisissez le formulaire à utiliser.";
+    }
+
+    private bool CanOpenSelectedForm() => SelectedForm is not null;
+
+    private bool CanOpenQueries() => SelectedForm is not null;
+
+    private bool CanOpenOngoingQueries() => SelectedForm is not null;
+
+    [RelayCommand(CanExecute = nameof(CanOpenSelectedForm))]
+    private async Task OpenSelectedFormAsync()
+    {
+        if (SelectedForm is null)
+        {
+            StatusMessage = "Sélectionnez un formulaire.";
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var vm =  SelectedForm.CreateCommandPageViewModel(
+            Activity, Performer, _billingClient);
+        await vm!.InitializeAsync();
+        await app.PushPageAsync(vm);
+    }
+
+    [RelayCommand(CanExecute = nameof(CanOpenQueries))]
+    private async Task OpenQueriesAsync()
+    {
+        if (SelectedForm is null)
+        {
+            StatusMessage = "Sélectionnez un formulaire.";
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var vm = new BillingQueriesPageViewModel(Activity, Performer, SelectedForm, _billingClient);
+        await vm.InitializeAsync();
+        await app.PushPageAsync(vm);
+    }
+
+    [RelayCommand(CanExecute = nameof(CanOpenOngoingQueries))]
+    private async Task OpenOngoingQueriesAsync()
+    {
+        if (SelectedForm is null)
+        {
+            StatusMessage = "Sélectionnez un formulaire.";
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var vm = new BillingQueriesPageViewModel(
+            Activity,
+            Performer,
+            SelectedForm,
+            _billingClient,
+            isReadOnly: true,
+            ongoingOnly: true);
+        await vm.InitializeAsync();
+        await app.PushPageAsync(vm);
+    }
+}

src/PostIt/PostIt/ViewModels/Commands/BillingCommandPageViewModel.cs

@@ -0,0 +1,108 @@
+using System;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using Yavsc;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+using Yavsc.Models.Billing;
+
+namespace PostIt.ViewModels;
+
+public abstract partial class BillingCommandPageViewModel : RemoteViewModelBase
+{
+    protected readonly BillingApiClient _billingClient;
+
+    public ActivityInfo Activity { get; }
+    public ActivityUserDisplayItem Performer { get; }
+    public CommandFormSummary Form { get; }
+
+    [ObservableProperty]
+    public partial bool IsBusy { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; }
+
+    [ObservableProperty]
+    public partial string Reason { get; set; } = string.Empty;
+
+
+
+    [ObservableProperty]
+    public partial bool Consent { get; set; } = true;
+
+
+    [ObservableProperty]
+    public partial string AdditionalInfo { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial long? ExistingQueryId { get; set; }
+
+    [ObservableProperty]
+    public partial QueryStatus CommandStatus { get; set; } = QueryStatus.Inserted;
+
+    public bool CanUseCurrentLocation => IsSupported && !IsBusy;
+
+    public string Title => Form.Title;
+    public string PerformerLabel => Performer.UserName;
+    public string ActivityLabel => Activity.Name;
+    public virtual bool IsSupported => true;
+    public string BillingRoute => $"/billing/{Form.ActionName}";
+    public bool IsEditingExisting => ExistingQueryId.HasValue;
+    public string SubmitLabel => IsEditingExisting ? "Mettre à jour la commande" : "Poster la commande";
+    public virtual string SupportMessage => $"Le formulaire {Form.ActionName} n'est pas encore pris en charge dans PostIt.";
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public BillingCommandPageViewModel(
+        ActivityInfo activity,
+        ActivityUserDisplayItem performer,
+        CommandFormSummary form,
+        BillingApiClient billingClient)
+    {
+        Activity = activity ?? throw new ArgumentNullException(nameof(activity));
+        Performer = performer ?? throw new ArgumentNullException(nameof(performer));
+        Form = form ?? throw new ArgumentNullException(nameof(form));
+        _billingClient = billingClient ?? throw new ArgumentNullException(nameof(billingClient));
+
+        StatusMessage = SupportMessage;
+    }
+
+    partial void OnExistingQueryIdChanged(long? value)
+    {
+        OnPropertyChanged(nameof(IsEditingExisting));
+        OnPropertyChanged(nameof(SubmitLabel));
+    }
+
+    partial void OnIsBusyChanged(bool value)
+    {
+        OnPropertyChanged(nameof(CanUseCurrentLocation));
+    }
+
+    public async Task InitializeAsync(BillingQueryDetailsDto? existingQuery = null)
+    {
+        await LoadAsync();
+        if (existingQuery is not null)
+        {
+            ApplyExistingQuery(existingQuery);
+            return;
+        }
+    }
+
+    protected abstract void ApplyExistingQuery(BillingQueryDetailsDto existingQuery);
+
+
+
+    [RelayCommand]
+    protected abstract Task SubmitAsync();
+}

src/PostIt/PostIt/ViewModels/Commands/BrushViewModel.cs

@@ -0,0 +1,165 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+using Yavsc.Models.Billing;
+using Yavsc.Models.Haircut;
+namespace PostIt.ViewModels.Commands;
+
+public partial class BrushViewModel : RdvViewModel
+{
+    public override string SupportMessage => "Choisissez une prestation coiffure puis postez la commande.";
+
+    [ObservableProperty]
+    public partial ObservableCollection<HairPrestationDto> AvailablePrestations { get; set; } = new();
+
+    [ObservableProperty]
+    public partial HairPrestationDto? SelectedPrestation { get; set; }
+
+    public BrushViewModel(ActivityInfo activity, ActivityUserDisplayItem performer, CommandFormSummary form, BillingApiClient billingClient)
+        : base(activity, performer, form, billingClient)
+    {
+    }
+
+    public override async Task LoadAsync()
+    {
+        var prestations = await _billingClient.GetHairPrestationsAsync(Form.ActionName);
+
+        AvailablePrestations = new ObservableCollection<HairPrestationDto>
+            (prestations ?? new List<HairPrestationDto>());
+
+        if (SelectedPrestation is null)
+        {
+            SelectedPrestation = AvailablePrestations.FirstOrDefault();
+        }
+
+    }
+
+    protected override void ApplyExistingQuery(BillingQueryDetailsDto existingQuery)
+    {
+        base.ApplyExistingQuery(existingQuery);
+
+        if (existingQuery.PrestationId is not null)
+        {
+            SelectedPrestation = AvailablePrestations.FirstOrDefault(x => x.Id == existingQuery.PrestationId.Value);
+        }
+
+        IsBusy = true;
+        try
+        {
+            if (SelectedPrestation is null)
+            {
+                SelectedPrestation = AvailablePrestations.FirstOrDefault();
+            }
+
+            StatusMessage = AvailablePrestations.Count == 0
+                ? "Aucune prestation coiffure disponible."
+                : SupportMessage;
+        }
+        catch (HttpRequestException ex)
+        when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            StatusMessage = "Accès refusé au catalogue de prestations (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Erreur lors du chargement des prestations: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    protected override async Task SubmitAsync()
+    {
+        if (!Consent)
+        {
+            StatusMessage = "Le consentement est requis pour poster la commande.";
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(Address))
+        {
+            StatusMessage = "L'adresse du rendez-vous est requise.";
+            return;
+        }
+
+        if (SelectedPrestation is null)
+        {
+            StatusMessage = "Sélectionnez une prestation coiffure.";
+            return;
+        }
+
+        IsBusy = true;
+        try
+        {
+            var address = Address.Trim();
+            var locationPayload = BuildLocationPayload(address, Latitude, Longitude);
+
+            var payload = new BillingQueryDetailsDto
+            {
+                Id = ExistingQueryId ?? 0,
+                BillingCode = Form.ActionName,
+                ActivityCode = Activity.Code,
+                PerformerId = Performer.PerformerId,
+                Consent = Consent,
+                EventDate = EventDate,
+                Status = CommandStatus,
+                Reason = Reason.Trim(),
+                AdditionalInfo = string.IsNullOrWhiteSpace(AdditionalInfo) ? string.Empty : AdditionalInfo.Trim(),
+                Location = new BillingLocationDto
+                {
+                    Address = address,
+                    Latitude = Latitude,
+                    Longitude = Longitude,
+                }
+            };
+
+            payload.PrestationId = SelectedPrestation.Id;
+
+            if (IsEditingExisting)
+            {
+                await _billingClient.UpdateAsync(Form.ActionName, ExistingQueryId!.Value, payload).ConfigureAwait(true);
+            }
+            else
+            {
+                await _billingClient.CreateAsync(Form.ActionName, new
+                {
+                    ActivityCode = Activity.Code,
+                    PerformerId = Performer.PerformerId,
+                    Consent,
+                    EventDate = (DateTime?)EventDate,
+                    Location = locationPayload,
+                    PrestationId = SelectedPrestation.Id,
+                    AdditionalInfo = string.IsNullOrWhiteSpace(AdditionalInfo) ? null : AdditionalInfo.Trim(),
+                    Status = payload.Status,
+                }).ConfigureAwait(true);
+            }
+
+            StatusMessage = IsEditingExisting
+                ? $"Commande #{ExistingQueryId} mise à jour sur {BillingRoute} pour {Performer.UserName}."
+                : $"Commande transmise sur {BillingRoute} pour {Performer.UserName}.";
+        }
+        catch (HttpRequestException ex)
+        when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            StatusMessage = "Accès refusé au billing (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Erreur lors de l'envoi de la commande: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+
+    }
+}

src/PostIt/PostIt/ViewModels/Commands/MBrushViewModel.cs

@@ -0,0 +1,130 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+using Yavsc.Models.Billing;
+
+namespace PostIt.ViewModels.Commands;
+
+public partial class MBrushViewModel : BrushViewModel
+{
+    public override string SupportMessage => "Choisissez une ou plusieurs prestations coiffure puis postez la commande.";
+
+    [ObservableProperty]
+    public partial ObservableCollection<SelectableHairPrestationItem> MultiPrestations { get; set; } = new();
+
+    public MBrushViewModel(ActivityInfo activity, ActivityUserDisplayItem performer, CommandFormSummary form, BillingApiClient billingClient)
+        : base(activity, performer, form, billingClient)
+    {
+    }
+
+    public override async Task LoadAsync()
+    {
+        await base.LoadAsync().ConfigureAwait(true);
+        MultiPrestations = new ObservableCollection<SelectableHairPrestationItem>(
+            AvailablePrestations.Select(SelectableHairPrestationItem.FromDto));
+    }
+
+    protected override void ApplyExistingQuery(BillingQueryDetailsDto existingQuery)
+    {
+        base.ApplyExistingQuery(existingQuery);
+
+        var selectedIds = existingQuery.PrestationIds is null
+            ? new HashSet<long>()
+            : new HashSet<long>(existingQuery.PrestationIds);
+
+        foreach (var item in MultiPrestations)
+        {
+            item.IsSelected = selectedIds.Contains(item.Id);
+        }
+    }
+
+    protected override async Task SubmitAsync()
+    {
+        if (!Consent)
+        {
+            StatusMessage = "Le consentement est requis pour poster la commande.";
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(Address))
+        {
+            StatusMessage = "L'adresse du rendez-vous est requise.";
+            return;
+        }
+
+        var selectedPrestations = MultiPrestations.Where(x => x.IsSelected).ToList();
+        if (selectedPrestations.Count == 0)
+        {
+            StatusMessage = "Sélectionnez au moins une prestation coiffure.";
+            return;
+        }
+
+        IsBusy = true;
+        try
+        {
+            var address = Address.Trim();
+            var locationPayload = BuildLocationPayload(address, Latitude, Longitude);
+
+            var payload = new BillingQueryDetailsDto
+            {
+                Id = ExistingQueryId ?? 0,
+                BillingCode = Form.ActionName,
+                ActivityCode = Activity.Code,
+                PerformerId = Performer.PerformerId,
+                Consent = Consent,
+                EventDate = EventDate,
+                Status = CommandStatus,
+                Reason = Reason.Trim(),
+                Location = new BillingLocationDto
+                {
+                    Address = address,
+                    Latitude = Latitude,
+                    Longitude = Longitude,
+                },
+                PrestationIds = selectedPrestations.Select(x => x.Id).ToList(),
+            };
+
+            if (IsEditingExisting)
+            {
+                await _billingClient.UpdateAsync(Form.ActionName, ExistingQueryId!.Value, payload).ConfigureAwait(true);
+            }
+            else
+            {
+                await _billingClient.CreateAsync(Form.ActionName, new
+                {
+                    ActivityCode = Activity.Code,
+                    PerformerId = Performer.PerformerId,
+                    Consent,
+                    EventDate = EventDate,
+                    Location = locationPayload,
+                    Prestations = selectedPrestations.Select(x => new { PrestationId = x.Id }).ToList(),
+                    Status = payload.Status,
+                }).ConfigureAwait(true);
+            }
+
+            StatusMessage = IsEditingExisting
+                ? $"Commande #{ExistingQueryId} mise à jour sur {BillingRoute} pour {Performer.UserName}."
+                : $"Commande transmise sur {BillingRoute} pour {Performer.UserName}.";
+        }
+        catch (HttpRequestException ex)
+            when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            StatusMessage = "Accès refusé au billing (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Erreur lors de l'envoi de la commande: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+}

src/PostIt/PostIt/ViewModels/Commands/RdvViewModel.cs

@@ -0,0 +1,211 @@
+using System;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PostIt.Services;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+
+namespace PostIt.ViewModels.Commands;
+
+public partial class RdvViewModel : BillingCommandPageViewModel
+{
+    public override string SupportMessage => "Complétez les informations du rendez-vous puis postez la commande.";
+
+    [ObservableProperty]
+    public partial string Address { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial double? Latitude { get; set; }
+
+    [ObservableProperty]
+    public partial double? Longitude { get; set; }
+
+
+    [ObservableProperty]
+    public partial DateTime EventDate { get; set; }
+
+    public RdvViewModel(ActivityInfo activity, ActivityUserDisplayItem performer, CommandFormSummary form, BillingApiClient billingClient)
+        : base(activity, performer, form, billingClient)
+    {
+        EventDate = DateTime.Now.AddDays(1);
+    }
+
+    protected override void ApplyExistingQuery(BillingQueryDetailsDto existingQuery)
+    {
+        ExistingQueryId = existingQuery.Id;
+        CommandStatus = existingQuery.Status;
+        Consent = existingQuery.Consent;
+        Reason = existingQuery.Reason ?? string.Empty;
+        AdditionalInfo = existingQuery.AdditionalInfo ?? string.Empty;
+
+        if (existingQuery.EventDate is not null)
+        {
+            EventDate = existingQuery.EventDate.Value
+                .ToLocalTime();
+        }
+
+        if (existingQuery.Location is not null)
+        {
+            Address = existingQuery.Location.Address ?? string.Empty;
+            Latitude = existingQuery.Location.Latitude;
+            Longitude = existingQuery.Location.Longitude;
+        }
+
+        StatusMessage = $"Commande #{existingQuery.Id} chargée.";
+    }
+
+    [RelayCommand(CanExecute = nameof(CanUseCurrentLocation))]
+    private async Task UseCurrentLocationAsync()
+    {
+        if (!CanUseCurrentLocation)
+        {
+            return;
+        }
+
+        IsBusy = true;
+        try
+        {
+            var result = await Platform.TryGetCurrentLocationAsync(default).ConfigureAwait(true);
+            if (!result.IsSuccess || !result.Latitude.HasValue || !result.Longitude.HasValue)
+            {
+                StatusMessage = result.Message;
+                return;
+            }
+
+            Latitude = result.Latitude.Value;
+            Longitude = result.Longitude.Value;
+            StatusMessage = string.IsNullOrWhiteSpace(Address)
+                ? "Position récupérée. Complétez l'adresse puis envoyez la commande."
+                : result.Message;
+        }
+        catch (OperationCanceledException)
+        {
+            StatusMessage = "La récupération de la position a été annulée.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Impossible de récupérer la position: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    protected static object BuildLocationPayload(string address, double? latitude, double? longitude)
+    {
+        if (latitude.HasValue && longitude.HasValue)
+        {
+            return new
+            {
+                Address = address,
+                Latitude = latitude.Value,
+                Longitude = longitude.Value,
+            };
+        }
+
+        return new
+        {
+            Address = address,
+        };
+    }
+
+
+    protected override async Task SubmitAsync()
+    {
+        if (!IsSupported)
+        {
+            StatusMessage = SupportMessage;
+            return;
+        }
+
+        if (!Consent)
+        {
+            StatusMessage = "Le consentement est requis pour poster la commande.";
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(Address))
+        {
+            StatusMessage = "L'adresse du rendez-vous est requise.";
+            return;
+        }
+
+
+        if (string.IsNullOrWhiteSpace(Reason))
+        {
+            StatusMessage = "Le motif du rendez-vous est requis.";
+            return;
+        }
+
+
+
+        IsBusy = true;
+        try
+        {
+            var address = Address.Trim();
+            var locationPayload = BuildLocationPayload(address, Latitude, Longitude);
+
+            var payload = new BillingQueryDetailsDto
+            {
+                Id = ExistingQueryId ?? 0,
+                BillingCode = Form.ActionName,
+                ActivityCode = Activity.Code,
+                PerformerId = Performer.PerformerId,
+                Consent = Consent,
+                EventDate = EventDate,
+                Status = CommandStatus,
+                Reason = Reason.Trim(),
+                AdditionalInfo = string.IsNullOrWhiteSpace(AdditionalInfo) ? string.Empty : AdditionalInfo.Trim(),
+                Location = new BillingLocationDto
+                {
+                    Address = address,
+                    Latitude = Latitude,
+                    Longitude = Longitude,
+                }
+            };
+
+            if (IsEditingExisting)
+            {
+                await _billingClient.UpdateAsync(Form.ActionName, ExistingQueryId!.Value, payload).ConfigureAwait(true);
+            }
+            else
+            {
+                await _billingClient.CreateAsync(Form.ActionName, new
+                {
+                    ActivityCode = Activity.Code,
+                    PerformerId = Performer.PerformerId,
+                    Consent,
+                    EventDate = EventDate,
+                    Location = locationPayload,
+                    Reason = payload.Reason,
+                    Status = payload.Status,
+                }).ConfigureAwait(true);
+            }
+
+            StatusMessage = IsEditingExisting
+                ? $"Commande #{ExistingQueryId} mise à jour sur {BillingRoute} pour {Performer.UserName}."
+                : $"Commande transmise sur {BillingRoute} pour {Performer.UserName}.";
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            StatusMessage = "Accès refusé au billing (scope 'api'). Déconnectez puis reconnectez-vous.";
+        }
+        catch (Exception ex)
+        {
+            StatusMessage = $"Erreur lors de l'envoi: {ex.Message}";
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    public override Task LoadAsync()
+    {
+        return Task.CompletedTask;
+    }
+}

src/PostIt/PostIt/ViewModels/HomePageViewModel.cs

@@ -1,4 +1,9 @@
+using System;
+using System.Threading.Tasks;
+using Avalonia;
 using CommunityToolkit.Mvvm.Input;
+using Microsoft.Extensions.DependencyInjection;
+using PostIt.Helpers;
 using PostIt.Services;
 namespace PostIt.ViewModels;
 
@@ -24,8 +29,25 @@ public class HomePageViewModel : ViewModelBase
         Settings = settings;
         SessionStatus = sessionStatus;
 
+        OpenActivities = new AsyncRelayCommand(OpenActivitiesAsync);
+
     }
-    public RelayCommand OpenBlogs { get; set; } = new RelayCommand(() => App.PushMainPageAsync());
+    public IAsyncRelayCommand OpenBlogs { get; } = new AsyncRelayCommand(App.PushBlogsPageAsync);
+    public IAsyncRelayCommand OpenActivities { get; }
+
+    private async Task OpenActivitiesAsync()
+    {
+        var app = (App?)Application.Current;
+        var vm = app?.ServiceProvider?.GetRequiredService<ActivitiesPageViewModel>();
+        if (app is null || vm is null)
+        {
+            throw new InvalidOperationException("Activities page is not available.");
+        }
+
+        await vm.RefreshAsync();
+        await app.PushPageAsync(vm);
+    }
+
     /// <summary>
     /// Avalonia designer constructor. Builds a self-contained VM
     /// with a freshly-constructed Settings so the XAML preview can

src/PostIt/PostIt/ViewModels/RemoteViewModelBase.cs

@@ -0,0 +1,10 @@
+using System.Threading.Tasks;
+
+namespace PostIt.ViewModels;
+
+public abstract class RemoteViewModelBase : ViewModelBase
+{
+     public abstract Task LoadAsync();
+
+
+}

src/PostIt/PostIt/ViewModels/SelectableHairPrestationItem.cs

@@ -0,0 +1,22 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using Yavsc.Models.Haircut;
+
+namespace PostIt.ViewModels;
+
+public partial class SelectableHairPrestationItem : ObservableObject
+{
+    public long Id { get; init; }
+    public string Title { get; init; } = string.Empty;
+    public string Details { get; init; } = string.Empty;
+
+    [ObservableProperty]
+    public partial bool IsSelected { get; set; }
+
+    public static SelectableHairPrestationItem FromDto(HairPrestationDto dto)
+        => new()
+        {
+            Id = dto.Id,
+            Title = dto.Title,
+            Details = dto.Details,
+        };
+}

src/PostIt/PostIt/ViewModels/Settings/Settings.cs

@@ -26,7 +26,7 @@ public partial class Settings : ViewModelBase
     public partial string BlogsApiUrl { get; set; } = "https://blogs.pschneider.fr/api/v1/";
 
     [ObservableProperty]
-    public partial string BusinessApiUrl { get; set; } = "https://business.pschneider.fr/api/v1/";
+    public partial string ApiUrl { get; set; } = "https://api.pschneider.fr/api/v1/";
 
     [ObservableProperty]
     public partial string SearchText { get; set; } = string.Empty;
@@ -45,7 +45,7 @@ public partial class Settings : ViewModelBase
 
     partial void OnDarkModeChanged(bool value) => MarkDirty();
     partial void OnBlogsApiUrlChanged(string value) => MarkDirty();
-    partial void OnBusinessApiUrlChanged(string value) => MarkDirty();
+    partial void OnApiUrlChanged(string value) => MarkDirty();
     partial void OnSearchTextChanged(string value) => MarkDirty();
 
     /// <summary>
@@ -154,7 +154,10 @@ public partial class Settings : ViewModelBase
     {
         "openid",        // OIDC: required for the id_token
         "profile",       // OIDC: standard profile claims
-        "offline_access" // OIDC: required to receive a refresh_token
+        "offline_access", // OIDC: required to receive a refresh_token
+        "blogs",
+        "api"
+
     };
 
     /// <summary>
@@ -297,8 +300,15 @@ public partial class Settings : ViewModelBase
             // → our overridden dispatcher-safe marshaller below.
             else lock (_mutationGate)
             {
+                var legacyApiUrl = TryReadLegacyApiUrl(json);
                 this.Authentication = settings.Authentication;
                 this.DarkMode = settings.DarkMode;
+                this.BlogsApiUrl = !string.IsNullOrWhiteSpace(settings.BlogsApiUrl)
+                    ? settings.BlogsApiUrl
+                    : legacyApiUrl ?? this.BlogsApiUrl;
+                this.ApiUrl = !string.IsNullOrWhiteSpace(settings.ApiUrl)
+                    ? settings.ApiUrl
+                    : this.ApiUrl;
                 this.SearchText = settings.SearchText ?? string.Empty;
                 if (!(settings.Authentication is null))
                 {
@@ -343,6 +353,26 @@ public partial class Settings : ViewModelBase
         }
     }
 
+    private static string? TryReadLegacyApiUrl(string json)
+    {
+        try
+        {
+            using var doc = JsonDocument.Parse(json);
+            if (doc.RootElement.TryGetProperty("ApiUrl", out var apiUrl)
+                && apiUrl.ValueKind == JsonValueKind.String)
+            {
+                return apiUrl.GetString();
+            }
+        }
+        catch
+        {
+            // Ignore legacy payload parse errors: normal deserialization
+            // already reports actionable diagnostics to the caller.
+        }
+
+        return null;
+    }
+
     private void UseDefaultSettings()
     {
         this.Authentication = new AuthenticationSettings
@@ -353,6 +383,8 @@ public partial class Settings : ViewModelBase
             Scopes = AuthenticationSettings.DefaultScopes
         };
         this.DarkMode = false;
+        this.BlogsApiUrl = "https://blogs.pschneider.fr/api/v1/";
+        this.ApiUrl = "https://api.pschneider.fr/api/v1/";
         this.SearchText = string.Empty;
     }
 

src/PostIt/PostIt/ViewModels/ViewModelBase.cs

@@ -1,8 +1,8 @@
-using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace PostIt.ViewModels;
 
-public abstract partial class ViewModelBase : ObservableObject
+public abstract class ViewModelBase : ObservableObject
 {
      /// <summary>
     /// Gets if the user can navigate to the next page

src/PostIt/PostIt/Views/ActivitiesPage.axaml

@@ -0,0 +1,147 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:PostIt.ViewModels"
+             xmlns:wf="using:Yavsc.Abstract.Workflow"
+             x:Class="PostIt.Views.ActivitiesPage"
+             x:DataType="vm:ActivitiesPageViewModel"
+             Header="Activités">
+    <Grid RowDefinitions="Auto,*,Auto" Margin="12">
+        <Grid.Styles>
+            <Style Selector="Border.user-badge">
+                <Setter Property="BorderThickness" Value="1" />
+                <Setter Property="CornerRadius" Value="6" />
+                <Setter Property="Padding" Value="5,0" />
+                <Setter Property="MinHeight" Value="16" />
+            </Style>
+            <Style Selector="TextBlock.user-badge-text">
+                <Setter Property="FontSize" Value="9" />
+                <Setter Property="FontWeight" Value="SemiBold" />
+                <Setter Property="VerticalAlignment" Value="Center" />
+            </Style>
+        </Grid.Styles>
+
+        <StackPanel Grid.Row="0" Orientation="Horizontal" Spacing="8">
+            <Button Content="🗘 Rafraîchir" Command="{Binding RefreshCommand}" />
+            <TextBlock Text="📑 Catalogue des activités" FontWeight="Bold" VerticalAlignment="Center" />
+        </StackPanel>
+
+        <Grid Grid.Row="1" Margin="0,12,0,12" ColumnDefinitions="*,16,*,16,*">
+            <Grid Grid.Column="0" RowDefinitions="Auto,*">
+                <TextBlock Grid.Row="0" Text="Activités" FontWeight="Bold" Margin="0,0,0,8" />
+                <ListBox Grid.Row="1"
+                         ItemsSource="{Binding Activities}"
+                         SelectedItem="{Binding SelectedActivity, Mode=TwoWay}">
+                    <ListBox.ItemTemplate>
+                        <DataTemplate x:DataType="wf:ActivityInfo">
+                            <StackPanel Spacing="2" Margin="0,0,0,8">
+                                <TextBlock Text="{Binding Name}" FontWeight="Bold" />
+                                <TextBlock Text="{Binding Description}" TextWrapping="Wrap" FontSize="11" Opacity="0.7" />
+                                <TextBlock Text="{Binding PerformerCount, StringFormat='Utilisateurs: {0}'}"
+                                           FontSize="11" Opacity="0.6" />
+                            </StackPanel>
+                        </DataTemplate>
+                    </ListBox.ItemTemplate>
+                </ListBox>
+            </Grid>
+
+            <Grid Grid.Column="2" RowDefinitions="Auto,Auto,*">
+                <TextBlock Grid.Row="0" Text="Spécialisations" FontWeight="Bold" Margin="0,0,0,8" />
+                <TextBlock Grid.Row="1"
+                           Text="{Binding SelectedActivityLabel, StringFormat='Pour : {0}'}"
+                           FontSize="11" Opacity="0.7" Margin="0,0,0,8" />
+                <ListBox Grid.Row="2"
+                         ItemsSource="{Binding Specializations}"
+                         SelectedItem="{Binding SelectedSpecialization, Mode=TwoWay}">
+                    <ListBox.ItemTemplate>
+                        <DataTemplate x:DataType="wf:ActivityInfo">
+                            <StackPanel Spacing="2" Margin="0,0,0,8">
+                                <TextBlock Text="{Binding Name}" FontWeight="Bold" />
+                                <TextBlock Text="{Binding Description}" TextWrapping="Wrap" FontSize="11" Opacity="0.7" />
+                                <TextBlock Text="{Binding PerformerCount, StringFormat='Utilisateurs: {0}'}"
+                                           FontSize="11" Opacity="0.6" />
+                            </StackPanel>
+                        </DataTemplate>
+                    </ListBox.ItemTemplate>
+                </ListBox>
+            </Grid>
+
+            <Grid Grid.Column="4" RowDefinitions="Auto,Auto,*,Auto">
+                <TextBlock Grid.Row="0" Text="Utilisateurs" FontWeight="Bold" Margin="0,0,0,8" />
+                <TextBlock Grid.Row="1"
+                           Text="{Binding CurrentActivityLabel, StringFormat='Activité affichée : {0}'}"
+                           FontSize="11" Opacity="0.7" Margin="0,0,0,8" />
+                <ListBox Grid.Row="2"
+                         ItemsSource="{Binding Performers}"
+                         SelectedItem="{Binding SelectedPerformer, Mode=TwoWay}">
+                    <ListBox.ItemTemplate>
+                        <DataTemplate x:DataType="vm:ActivityUserDisplayItem">
+                            <StackPanel Spacing="2" Margin="0,0,0,8">
+                                <StackPanel Orientation="Horizontal" Spacing="6" VerticalAlignment="Center">
+                                    <Border Width="24"
+                                            Height="24"
+                                            CornerRadius="12"
+                                            ClipToBounds="True"
+                                            Background="#E9ECEF">
+                                        <Grid>
+                                            <TextBlock Text="{Binding AvatarFallbackLabel}"
+                                                       HorizontalAlignment="Center"
+                                                       VerticalAlignment="Center"
+                                                       FontWeight="SemiBold"
+                                                       Foreground="#495057" />
+                                            <Image Source="{Binding AvatarImage}"
+                                                   Width="24"
+                                                   Height="24"
+                                                   Stretch="UniformToFill" />
+                                        </Grid>
+                                    </Border>
+                                    <TextBlock Text="{Binding UserName}" FontWeight="Bold" />
+                                    <Border IsVisible="{Binding HasPerformerProfile}"
+                                            Classes="user-badge"
+                                            Background="#D9F5E5"
+                                            BorderBrush="#2E7D32"
+                                            >
+                                        <TextBlock Text="{Binding PerformerBadgeLabel}"
+                                                   Classes="user-badge-text"
+                                                   Foreground="#1B5E20"
+                                                   />
+                                    </Border>
+                                    <Border IsVisible="{Binding HasPerformerProfile}"
+                                            Classes="user-badge"
+                                            Background="{Binding PerformerStatusBadgeBackground}"
+                                            BorderBrush="{Binding PerformerStatusBadgeBorder}"
+                                            >
+                                        <TextBlock Text="{Binding PerformerStatusBadgeLabel}"
+                                                   Classes="user-badge-text"
+                                                   Foreground="{Binding PerformerStatusBadgeForeground}"
+                                                   />
+                                    </Border>
+                                </StackPanel>
+                                <TextBlock Text="{Binding WebSite}" FontSize="11" Opacity="0.7" />
+                                <TextBlock Text="{Binding ExtraActivityLabel}"
+                                           FontSize="11" Opacity="0.6" />
+                            </StackPanel>
+                        </DataTemplate>
+                    </ListBox.ItemTemplate>
+                </ListBox>
+                <Button Grid.Row="3"
+                        Margin="0,8,0,0"
+                        Content="Voir les formulaires"
+                        Command="{Binding OpenCommandFormsCommand}" />
+            </Grid>
+        </Grid>
+
+        <Grid Grid.Row="2" ColumnDefinitions="*,Auto">
+            <TextBox Grid.Column="0"
+                     Text="{Binding StatusMessage}"
+                     IsReadOnly="True"
+                     AcceptsReturn="True"
+                     TextWrapping="Wrap"
+                     BorderThickness="0"
+                     BorderBrush="Transparent"
+                     Padding="0"
+                     Background="Transparent"
+                     VerticalAlignment="Center" />
+            <ProgressBar Grid.Column="1" Width="120" IsIndeterminate="True" IsVisible="{Binding IsBusy}" />
+        </Grid>
+    </Grid>
+</ContentPage>

src/PostIt/PostIt/Views/ActivitiesPage.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PostIt.Views;
+
+public partial class ActivitiesPage : ContentPage
+{
+    public ActivitiesPage()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/PostIt/PostIt/Views/BillingQueriesPage.axaml

@@ -0,0 +1,52 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:PostIt.ViewModels"
+             x:Class="PostIt.Views.BillingQueriesPage"
+             x:DataType="vm:BillingQueriesPageViewModel"
+             Header="Commandes billing">
+    <Grid RowDefinitions="Auto,Auto,*,Auto" Margin="12">
+        <StackPanel Grid.Row="0" Spacing="2">
+            <TextBlock Text="{Binding Title}" FontSize="18" FontWeight="Bold" />
+            <TextBlock Text="{Binding ContextLabel}" Opacity="0.75" />
+        </StackPanel>
+
+        <StackPanel Grid.Row="1" Orientation="Horizontal" Spacing="8" Margin="0,12,0,12">
+            <Button Content="Rafraîchir" Command="{Binding RefreshCommand}" />
+            <Button Content="Ouvrir la commande"
+                    Command="{Binding OpenSelectedQueryCommand}"
+                    IsVisible="{Binding CanOpenDetails}" />
+        </StackPanel>
+
+        <ListBox Grid.Row="2" ItemsSource="{Binding Queries}" SelectedItem="{Binding SelectedQuery, Mode=TwoWay}">
+            <ListBox.ItemTemplate>
+                <DataTemplate x:DataType="vm:BillingQueryDisplayItem">
+                    <Border BorderThickness="0,0,0,1" BorderBrush="#22000000" Padding="0,0,0,10" Margin="0,0,0,10">
+                        <StackPanel Spacing="3">
+                            <TextBlock Text="{Binding Description}" FontWeight="Bold" />
+                            <TextBlock Text="{Binding Summary}" TextWrapping="Wrap" FontSize="12" Opacity="0.8" />
+                            <StackPanel Orientation="Horizontal" Spacing="8">
+                                <TextBlock Text="{Binding EventDateLabel}" FontSize="11" Opacity="0.7" />
+                                <TextBlock Text="{Binding StatusLabel}" FontSize="11" Opacity="0.7" />
+                                <TextBlock Text="{Binding BillingCode}" FontSize="11" Opacity="0.6" />
+                            </StackPanel>
+                        </StackPanel>
+                    </Border>
+                </DataTemplate>
+            </ListBox.ItemTemplate>
+        </ListBox>
+
+        <Grid Grid.Row="3" ColumnDefinitions="*,Auto" Margin="0,12,0,0">
+            <TextBox Grid.Column="0"
+                     Text="{Binding StatusMessage}"
+                     IsReadOnly="True"
+                     AcceptsReturn="True"
+                     TextWrapping="Wrap"
+                     BorderThickness="0"
+                     BorderBrush="Transparent"
+                     Padding="0"
+                     Background="Transparent"
+                     VerticalAlignment="Center" />
+            <ProgressBar Grid.Column="1" Width="120" IsIndeterminate="True" IsVisible="{Binding IsBusy}" />
+        </Grid>
+    </Grid>
+</ContentPage>

src/PostIt/PostIt/Views/BillingQueriesPage.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PostIt.Views;
+
+public partial class BillingQueriesPage : ContentPage
+{
+    public BillingQueriesPage()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/PostIt/PostIt/Views/CommandFormsPage.axaml

@@ -0,0 +1,56 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:PostIt.ViewModels"
+             xmlns:wf="using:Yavsc.Abstract.Workflow"
+             x:Class="PostIt.Views.CommandFormsPage"
+             x:DataType="vm:CommandFormsPageViewModel"
+             Header="Formulaires">
+    <Grid RowDefinitions="Auto,Auto,*,Auto" Margin="12">
+        <TextBlock Grid.Row="0"
+                   Text="{Binding Title}"
+                   FontSize="18"
+                   FontWeight="Bold" />
+
+        <TextBlock Grid.Row="1"
+                   Margin="0,4,0,12"
+                   Text="{Binding ContextLabel}"
+                   Opacity="0.75" />
+
+        <ListBox Grid.Row="2"
+                 ItemsSource="{Binding Forms}"
+                 SelectedItem="{Binding SelectedForm, Mode=TwoWay}">
+            <ListBox.ItemTemplate>
+                <DataTemplate x:DataType="wf:CommandFormSummary">
+                    <StackPanel Spacing="2" Margin="0,0,0,10">
+                        <TextBlock Text="{Binding Title}" FontWeight="Bold" />
+                        <TextBlock Text="{Binding ActionName, StringFormat='Route billing : /billing/{0}'}"
+                                   FontSize="11"
+                                   Opacity="0.7" />
+                    </StackPanel>
+                </DataTemplate>
+            </ListBox.ItemTemplate>
+        </ListBox>
+
+        <Grid Grid.Row="3" Margin="0,12,0,0" ColumnDefinitions="Auto,8,Auto,8,Auto,12,*">
+            <Button Grid.Column="0"
+                    Content="Ouvrir le formulaire"
+                    Command="{Binding OpenSelectedFormCommand}" />
+            <Button Grid.Column="2"
+                Content="Voir les commandes"
+                Command="{Binding OpenQueriesCommand}" />
+            <Button Grid.Column="4"
+                    Content="Demandes en cours (lecture seule)"
+                    Command="{Binding OpenOngoingQueriesCommand}" />
+            <TextBox Grid.Column="6"
+                     Text="{Binding StatusMessage}"
+                     IsReadOnly="True"
+                     AcceptsReturn="True"
+                     TextWrapping="Wrap"
+                     BorderThickness="0"
+                     BorderBrush="Transparent"
+                     Padding="0"
+                     Background="Transparent"
+                     VerticalAlignment="Center" />
+        </Grid>
+    </Grid>
+</ContentPage>

src/PostIt/PostIt/Views/CommandFormsPage.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PostIt.Views;
+
+public partial class CommandFormsPage : ContentPage
+{
+    public CommandFormsPage()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/PostIt/PostIt/Views/Commands/BrushPage.axaml

@@ -0,0 +1,113 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:cvm="using:PostIt.ViewModels.Commands"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="PostIt.Views.Commands.BrushPage"
+
+             x:DataType="cvm:BrushViewModel"
+             Header="Commande billing">
+  <ScrollViewer>
+    <Grid RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="Auto,*" Margin="12">
+      <TextBlock Grid.Row="0" Grid.ColumnSpan="2"
+                 Text="{Binding Title}"
+                 FontSize="18"
+                 FontWeight="Bold" />
+
+      <TextBlock Grid.Row="1" Grid.ColumnSpan="2"
+                 Margin="0,4,0,12"
+                 Text="{Binding SupportMessage}"
+                 TextWrapping="Wrap"
+                 Opacity="0.8" />
+
+      <TextBlock Grid.Row="2" Text="Utilisateur" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding PerformerLabel}" IsReadOnly="True" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="3" Text="Activité" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding ActivityLabel}" IsReadOnly="True" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="4" Text="Date" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <DatePicker Grid.Row="4" Grid.Column="1" DayFormat="ddd dd" SelectedDate="{Binding EventDate, Mode=TwoWay}" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="5"
+                 Text="Motif"
+                 VerticalAlignment="Center"
+                 Margin="0,0,12,8" />
+      <TextBox Grid.Row="5"
+               Grid.Column="1"
+               Text="{Binding Reason, Mode=TwoWay}"
+               Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="6" Text="Adresse" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="6" Grid.Column="1" Text="{Binding Address, Mode=TwoWay}" Margin="0,0,0,8" />
+
+      <Button Grid.Row="7"
+              Grid.ColumnSpan="2"
+              HorizontalAlignment="Left"
+              Margin="0,0,0,8"
+              Content="Utiliser ma position"
+              Command="{Binding UseCurrentLocationCommand}" />
+
+      <TextBlock Grid.Row="8" Text="Latitude" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="8" Grid.Column="1" Text="{Binding Latitude, Mode=TwoWay}" PlaceholderText="Optionnel" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="9" Text="Longitude" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="9" Grid.Column="1" Text="{Binding Longitude, Mode=TwoWay}" PlaceholderText="Optionnel" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="10"
+                 Text="Prestation"
+                 VerticalAlignment="Center"
+                 Margin="0,0,12,8" />
+      <ComboBox Grid.Row="10"
+                Grid.Column="1"
+                ItemsSource="{Binding AvailablePrestations}"
+                SelectedItem="{Binding SelectedPrestation, Mode=TwoWay}"
+                Margin="0,0,0,8">
+        <ComboBox.ItemTemplate>
+          <DataTemplate>
+            <StackPanel Spacing="2">
+              <TextBlock Text="{Binding Title}" FontWeight="Bold" />
+              <TextBlock Text="{Binding Details}" FontSize="11" Opacity="0.7" TextWrapping="Wrap" />
+            </StackPanel>
+          </DataTemplate>
+        </ComboBox.ItemTemplate>
+      </ComboBox>
+
+      <TextBlock Grid.Row="12"
+                 Text="Informations"
+                 VerticalAlignment="Center"
+                 Margin="0,0,12,8" />
+      <TextBox Grid.Row="12"
+               Grid.Column="1"
+               Text="{Binding AdditionalInfo, Mode=TwoWay}"
+               Margin="0,0,0,8" />
+
+      <CheckBox Grid.Row="13" Grid.ColumnSpan="2"
+                Content="Je consens à la création de cette commande"
+                IsChecked="{Binding Consent, Mode=TwoWay}"
+                Margin="0,4,0,12" />
+
+      <Grid Grid.Row="14" Grid.ColumnSpan="2" ColumnDefinitions="Auto,12,*,Auto">
+        <Button Grid.Column="0"
+                Content="{Binding SubmitLabel}"
+                Command="{Binding SubmitCommand}"
+                IsEnabled="{Binding IsSupported}" />
+        <TextBox Grid.Column="2"
+                 Text="{Binding StatusMessage}"
+                 IsReadOnly="True"
+                 AcceptsReturn="True"
+                 TextWrapping="Wrap"
+                 BorderThickness="0"
+                 BorderBrush="Transparent"
+                 Padding="0"
+                 Background="Transparent"
+                 VerticalAlignment="Center" />
+        <ProgressBar Grid.Column="3"
+                     Width="120"
+                     IsIndeterminate="True"
+                     IsVisible="{Binding IsBusy}" />
+      </Grid>
+    </Grid>
+  </ScrollViewer>
+</ContentPage>

src/PostIt/PostIt/Views/Commands/BrushPage.axaml.cs

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PostIt.Views.Commands;
+
+public partial class BrushPage : ContentPage
+{
+    public BrushPage()
+    {
+        InitializeComponent();
+    }
+}

src/PostIt/PostIt/Views/Commands/RdvPage.axaml

@@ -0,0 +1,91 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:cvm="using:PostIt.ViewModels.Commands"
+             x:Class="PostIt.Views.Commands.RdvPage"
+             x:DataType="cvm:RdvViewModel"
+             Header="Commande billing">
+  <ScrollViewer>
+    <Grid RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="Auto,*" Margin="12">
+      <TextBlock Grid.Row="0" Grid.ColumnSpan="2"
+                 Text="{Binding Title}"
+                 FontSize="18"
+                 FontWeight="Bold" />
+
+      <TextBlock Grid.Row="1" Grid.ColumnSpan="2"
+                 Margin="0,4,0,12"
+                 Text="{Binding SupportMessage}"
+                 TextWrapping="Wrap"
+                 Opacity="0.8" />
+
+      <TextBlock Grid.Row="2" Text="Utilisateur" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding PerformerLabel}" IsReadOnly="True" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="3" Text="Activité" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding ActivityLabel}" IsReadOnly="True" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="4" Text="Date" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <DatePicker Grid.Row="4" Grid.Column="1" DayFormat="ddd dd" SelectedDate="{Binding EventDate, Mode=TwoWay}" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="5"
+                 Text="Motif"
+                 VerticalAlignment="Center"
+                 Margin="0,0,12,8" />
+      <TextBox Grid.Row="5"
+               Grid.Column="1"
+               Text="{Binding Reason, Mode=TwoWay}"
+               Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="6" Text="Adresse" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="6" Grid.Column="1" Text="{Binding Address, Mode=TwoWay}" Margin="0,0,0,8" />
+
+      <Button Grid.Row="7"
+              Grid.ColumnSpan="2"
+              HorizontalAlignment="Left"
+              Margin="0,0,0,8"
+              Content="Utiliser ma position"
+              Command="{Binding UseCurrentLocationCommand}" />
+
+      <TextBlock Grid.Row="8" Text="Latitude" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="8" Grid.Column="1" Text="{Binding Latitude, Mode=TwoWay}" PlaceholderText="Optionnel" Margin="0,0,0,8" />
+
+      <TextBlock Grid.Row="9" Text="Longitude" VerticalAlignment="Center" Margin="0,0,12,8" />
+      <TextBox Grid.Row="9" Grid.Column="1" Text="{Binding Longitude, Mode=TwoWay}" PlaceholderText="Optionnel" Margin="0,0,0,8" />
+
+
+      <TextBlock Grid.Row="12"
+                 Text="Informations"
+                 VerticalAlignment="Center"
+                 Margin="0,0,12,8" />
+      <TextBox Grid.Row="12"
+               Grid.Column="1"
+               Text="{Binding AdditionalInfo, Mode=TwoWay}"
+               Margin="0,0,0,8" />
+
+      <CheckBox Grid.Row="13" Grid.ColumnSpan="2"
+                Content="Je consens à la création de cette commande"
+                IsChecked="{Binding Consent, Mode=TwoWay}"
+                Margin="0,4,0,12" />
+
+      <Grid Grid.Row="14" Grid.ColumnSpan="2" ColumnDefinitions="Auto,12,*,Auto">
+        <Button Grid.Column="0"
+                Content="{Binding SubmitLabel}"
+                Command="{Binding SubmitCommand}"
+                IsEnabled="{Binding IsSupported}" />
+        <TextBox Grid.Column="2"
+                 Text="{Binding StatusMessage}"
+                 IsReadOnly="True"
+                 AcceptsReturn="True"
+                 TextWrapping="Wrap"
+                 BorderThickness="0"
+                 BorderBrush="Transparent"
+                 Padding="0"
+                 Background="Transparent"
+                 VerticalAlignment="Center" />
+        <ProgressBar Grid.Column="3"
+                     Width="120"
+                     IsIndeterminate="True"
+                     IsVisible="{Binding IsBusy}" />
+      </Grid>
+    </Grid>
+  </ScrollViewer>
+</ContentPage>

src/PostIt/PostIt/Views/Commands/RdvPage.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PostIt.Views.Commands;
+
+public partial class RdvPage : ContentPage
+{
+    public RdvPage()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/PostIt/PostIt/Views/HomePage.axaml

@@ -18,5 +18,9 @@
                   Command="{Binding OpenBlogs}"
                   HorizontalAlignment="Center"
                   IsEnabled="{Binding SessionStatus.IsLoggedIn}"/>
+          <Button Content="Parcourir les activités"
+              Command="{Binding OpenActivities}"
+              HorizontalAlignment="Center"
+              IsEnabled="{Binding SessionStatus.IsLoggedIn}"/>
         </StackPanel>
 </ContentPage>

src/PostIt/PostIt/Views/MainPage.axaml

@@ -24,13 +24,13 @@
             <RowDefinition Height="Auto" />
         </Grid.RowDefinitions>
 
-        <StackPanel Grid.Row="0" Spacing="12"
+        <Border Grid.Row="0"
                 HorizontalAlignment="Stretch"
-                    VerticalAlignment="Top">
-
-            <StackPanel Orientation="Horizontal" Spacing="8">
-                <Button Command="{Binding RefreshAsync}" Content="Refresh" />
-                <Button Command="{Binding SearchAsync}" Content="Filter" />
+                VerticalAlignment="Top"
+                Padding="0">
+            <WrapPanel Orientation="Horizontal">
+                <Button Command="{Binding RefreshAsync}" Content="🗘 Refresh" />
+                <Button Command="{Binding SearchAsync}" Content="🔍 Filter" />
                 <Button Command="{Binding SaveAsync}" Content="Save" />
                 <Button Command="{Binding DeleteAsync}" Content="Delete" />
                 <Button x:Name="ManageAclButton"
@@ -62,8 +62,8 @@
                         Command="{Binding OpenSignatureDevAsync}"
                         Content="[DEV] Signature"
                         ToolTip.Tip="DEV ONLY — to remove when SignalR handler lands" />
-            </StackPanel>
-        </StackPanel>
+            </WrapPanel>
+        </Border>
 
         <Border Grid.Row="1" BorderBrush="Gray" BorderThickness="1" Padding="8">
             <ListBox ItemsSource="{Binding FilteredPosts}" SelectedItem="{Binding SelectedPost, Mode=TwoWay}"

src/PostIt/PostIt/Views/SettingsPage.axaml

@@ -39,13 +39,28 @@
         <TextBox Grid.Row="7" x:Name="BlogsApiUrlTextBox"
         Text="{Binding BlogsApiUrl, Mode=TwoWay}"/>
 
-        <TextBlock Grid.Row="8" Text="Business API URL"/>
+        <TextBlock Grid.Row="8" Text="API URL"/>
         <TextBox Grid.Row="9" x:Name="BusinessApiUrlTextBox"
-        Text="{Binding BusinessApiUrl, Mode=TwoWay}"/>
+        Text="{Binding ApiUrl, Mode=TwoWay}"/>
 
         <TextBlock Grid.Row="10" Text="Dark mode"/>
         <CheckBox Grid.Row="11" x:Name="DarkModeCheckBox" IsChecked="{Binding DarkMode, Mode=TwoWay}"/>
 
+        <StackPanel Grid.Row="12" Spacing="8">
+            <TextBlock Text="Avatar: PNG, JPG/JPEG, WEBP, GIF. Taille max 2 MB."
+                   Opacity="0.8"
+                   TextWrapping="Wrap" />
+
+            <TextBlock x:Name="AvatarUploadStatusText"
+                       Text=""
+                       TextWrapping="Wrap" />
+
+            <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
+            <Button x:Name="ChooseAvatarButton"
+                Content="Choisir l'avatar"
+                    Click="ChooseAvatar_Click"
+                    Margin="0,0,8,0"/>
+
             <!-- Sauver: bound to the Save RelayCommand on the Settings
                  VM. The source generator emits an ICommand property whose
                  name matches the source method exactly (no "Command"
@@ -54,10 +69,11 @@
                  de binding pour [RelayCommand]" for the full rationale.
                  IsEnabled tracks IsDirty so the button auto-disables
                  when there's nothing to persist. -->
-        <Button Grid.Row="12" Content="Sauver"
-                HorizontalAlignment="Right"
+            <Button Content="Sauver"
                     Command="{Binding Save}"
                     IsEnabled="{Binding IsDirty}"/>
+                </StackPanel>
+        </StackPanel>
 
     </Grid>
 </ContentPage>

src/PostIt/PostIt/Views/SettingsPage.axaml.cs

@@ -1,12 +1,116 @@
 
 
+using System;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using Avalonia.Controls;
+using Avalonia.Media;
+using Avalonia.Platform.Storage;
+using Microsoft.Extensions.DependencyInjection;
+using PostIt.Services;
 
 namespace PostIt.Views;
 public partial class SettingsPage: ContentPage
 {
+    private const int MaxAvatarSizeMegabytes = 2;
+    private const string AcceptedAvatarFormats = "PNG, JPG/JPEG, WEBP, GIF";
+
+    private int _avatarStatusVersion;
+
     public SettingsPage()
     {
         InitializeComponent();
     }
+
+    private async void ChooseAvatar_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        var statusVersion = Interlocked.Increment(ref _avatarStatusVersion);
+        ChooseAvatarButton.IsEnabled = false;
+        SetAvatarStatus("Sélection d'un fichier avatar...", Brushes.Gray);
+
+        var topLevel = TopLevel.GetTopLevel(this);
+        if (topLevel is null)
+        {
+            SetAvatarStatus("Impossible d'accéder à la fenêtre active.", Brushes.IndianRed);
+            ChooseAvatarButton.IsEnabled = true;
+            return;
+        }
+
+        var files = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
+        {
+            Title = "Choisir un avatar",
+            AllowMultiple = false,
+            FileTypeFilter = new[]
+            {
+                new FilePickerFileType("Images")
+                {
+                    Patterns = new[] { "*.png", "*.jpg", "*.jpeg", "*.webp", "*.gif" }
+                }
+            }
+        });
+
+        var file = files.FirstOrDefault();
+        if (file is null)
+        {
+            SetAvatarStatus("Upload annulé.", Brushes.Gray);
+            ChooseAvatarButton.IsEnabled = true;
+            return;
+        }
+
+        try
+        {
+            SetAvatarStatus("Upload avatar en cours...", Brushes.Gray);
+
+            await using var stream = await file.OpenReadAsync();
+            var api = ((App)App.Current!).ServiceProvider!.GetRequiredService<YavscApiClient>();
+            var message = await api.SetAvatarAsync(stream, file.Name, GetMimeType(file.Name));
+            SetAvatarStatus(string.IsNullOrWhiteSpace(message)
+                ? "Avatar mis à jour."
+                : message, Brushes.ForestGreen);
+
+            _ = ClearSuccessStatusLaterAsync(statusVersion);
+        }
+        catch (Exception ex)
+        {
+            SetAvatarStatus($"Échec upload avatar: {ex.Message}", Brushes.IndianRed);
+            Console.Error.WriteLine($"🩎 Avatar upload failed: {ex.Message}");
+        }
+        finally
+        {
+            ChooseAvatarButton.IsEnabled = true;
+        }
+    }
+
+    private async Task ClearSuccessStatusLaterAsync(int statusVersion)
+    {
+        await Task.Delay(TimeSpan.FromSeconds(5)).ConfigureAwait(true);
+        if (statusVersion != _avatarStatusVersion)
+            return;
+
+        if (AvatarUploadStatusText.Foreground == Brushes.ForestGreen)
+        {
+            SetAvatarStatus($"Avatar prêt. Formats supportés: {AcceptedAvatarFormats}. Taille max: {MaxAvatarSizeMegabytes} MB.", Brushes.Gray);
+        }
+    }
+
+    private void SetAvatarStatus(string message, IBrush color)
+    {
+        AvatarUploadStatusText.Foreground = color;
+        AvatarUploadStatusText.Text = message;
+    }
+
+    private static string GetMimeType(string fileName)
+    {
+        var ext = Path.GetExtension(fileName)?.ToLowerInvariant();
+        return ext switch
+        {
+            ".png" => "image/png",
+            ".jpg" or ".jpeg" => "image/jpeg",
+            ".webp" => "image/webp",
+            ".gif" => "image/gif",
+            _ => "application/octet-stream"
+        };
+    }
 }

src/PostIt/PostIt/Views/SignaturePage.axaml.cs

@@ -62,9 +62,16 @@ public partial class SignaturePage : ContentPage
         var h = PadFrame.Bounds.Height;
         if (w <= 0 || h <= 0) return;
 
+        var pending = _control.PendingStroke;
         var strokes = _control.Strokes;
+        int sealedCount = strokes.Count - pending.Count;
+        if (sealedCount < 0)
+        {
+            sealedCount = 0;
+        }
+
         int i = 0;
-        while (i < strokes.Count)
+        while (i < sealedCount)
         {
             int k = strokes[i];
             if (k <= 0) break;
@@ -87,5 +94,27 @@ public partial class SignaturePage : ContentPage
             poly.Points = pts;
             InkLayer.Children.Add(poly);
         }
+
+        if (pending.Count > 0)
+        {
+            var poly = new Polyline
+            {
+                Stroke = StrokeBrush,
+                StrokeThickness = StrokeThickness,
+                StrokeLineCap = PenLineCap.Round,
+                StrokeJoin = PenLineJoin.Round,
+            };
+
+            var pts = new List<Point>(pending.Count / 2);
+            for (int p = 0; p < pending.Count; p += 2)
+            {
+                int nx = pending[p];
+                int ny = pending[p + 1];
+                pts.Add(new Point(nx / CoordinateMax * w, ny / CoordinateMax * h));
+            }
+
+            poly.Points = pts;
+            InkLayer.Children.Add(poly);
+        }
     }
 }

src/Yavsc.Abstract/HairCut/HairPrestationDto.cs

@@ -0,0 +1,11 @@
+namespace Yavsc.Models.Haircut;
+
+/// <summary>
+/// Lightweight hair-prestation description exposed to API clients.
+/// </summary>
+public sealed class HairPrestationDto
+{
+    public long Id { get; set; }
+    public string Title { get; set; } = string.Empty;
+    public string Details { get; set; } = string.Empty;
+}

src/Yavsc.Abstract/Workflow/ActivityInfo.cs

@@ -0,0 +1,17 @@
+namespace Yavsc.Abstract.Workflow;
+
+/// <summary>
+/// Activity node returned by the browsing API.
+/// </summary>
+public sealed class ActivityInfo
+{
+    public string Code { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public string ParentCode { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public string Photo { get; set; } = string.Empty;
+    public int Rate { get; set; }
+    public int PerformerCount { get; set; }
+    public List<CommandFormSummary> Forms { get; set; } = new();
+    public List<ActivityInfo> Children { get; set; } = new();
+}

src/Yavsc.Abstract/Workflow/CommandFormSummary.cs

@@ -0,0 +1,11 @@
+namespace Yavsc.Abstract.Workflow;
+
+/// <summary>
+/// Lightweight command-form description exposed to API clients.
+/// </summary>
+public sealed class CommandFormSummary
+{
+    public long Id { get; set; }
+    public string ActionName { get; set; } = string.Empty;
+    public string Title { get; set; } = string.Empty;
+}

src/Yavsc.Abstract/Workflow/Country.cs

@@ -0,0 +1,19 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Yavsc.Models.Workflow
+{
+    /// <summary>
+    /// Supported country of exercise for performer profile validations.
+    /// </summary>
+    public class Country
+    {
+        [Key]
+        [MaxLength(2)]
+        [MinLength(2)]
+        public string Code { get; set; } = string.Empty;
+
+        [Required]
+        [MaxLength(64)]
+        public string DisplayName { get; set; } = string.Empty;
+    }
+}

src/Yavsc.Abstract/Workflow/IPerformerProfile.cs

@@ -3,6 +3,7 @@ namespace Yavsc.Workflow
     public interface IPerformerProfile
     {
         string PerformerId { get; set; }
+        string ExerciseCountryCode { get; set; }
         string SIREN { get; set; }
         bool AcceptNotifications { get; set; }
         long OrganizationAddressId { get; set; }

src/Yavsc.Abstract/Workflow/PerformerActivity.cs

@@ -0,0 +1,19 @@
+namespace Yavsc.Abstract.Workflow;
+
+/// <summary>
+/// Lightweight performer description returned for one activity.
+/// </summary>
+public sealed class PerformerActivity
+{
+    public string PerformerId { get; set; } = string.Empty;
+    public bool HasPerformerProfile { get; set; }
+    public string UserName { get; set; } = string.Empty;
+    public bool Active { get; set; }
+    public bool AcceptNotifications { get; set; }
+    public bool AcceptPublicContact { get; set; }
+    public string WebSite { get; set; } = string.Empty;
+    public string ActivityCode { get; set; } = string.Empty;
+    public string ActivityName { get; set; } = string.Empty;
+    public string SettingsClassName { get; set; } = string.Empty;
+    public int ExtraActivityCount { get; set; }
+}

src/Yavsc.Abstract/Workflow/PerformerCodeInputValidation.cs

@@ -0,0 +1,86 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Yavsc.Models.Workflow
+{
+    /// <summary>
+    /// Validation rule for performer business code input by country.
+    /// </summary>
+    public class PerformerCodeInputValidation
+    {
+        [Key]
+        public long Id { get; set; }
+
+        [Required]
+        [MaxLength(2)]
+        [MinLength(2)]
+        public string CountryCode { get; set; } = string.Empty;
+
+        [Required]
+        [MaxLength(256)]
+        public string RegularExpression { get; set; } = string.Empty;
+
+        [Required]
+        [MaxLength(128)]
+        public string ErrorMessage { get; set; } = string.Empty;
+
+        [ForeignKey(nameof(CountryCode))]
+        public Country Country { get; set; }
+    }
+
+    public static class PerformerCodeInputValidationCatalog
+    {
+        public static readonly IReadOnlyList<Country> Countries = new List<Country>
+        {
+            new() { Code = "fr", DisplayName = "France" },
+            new() { Code = "en", DisplayName = "England" },
+            new() { Code = "pt", DisplayName = "Portugal" },
+        };
+
+        public static readonly IReadOnlyList<PerformerCodeInputValidation> Rules = new List<PerformerCodeInputValidation>
+        {
+            new()
+            {
+                Id = 1,
+                CountryCode = "fr",
+                RegularExpression = "^[0-9]{9,14}$",
+                ErrorMessage = "Le code FR doit contenir entre 9 et 14 chiffres."
+            },
+            new()
+            {
+                Id = 2,
+                CountryCode = "en",
+                RegularExpression = "^[A-Za-z0-9]{8,14}$",
+                ErrorMessage = "Le code EN doit contenir entre 8 et 14 caracteres alphanumeriques."
+            },
+            new()
+            {
+                Id = 3,
+                CountryCode = "pt",
+                RegularExpression = "^[0-9]{9}$",
+                ErrorMessage = "Le code PT doit contenir exactement 9 chiffres."
+            },
+        };
+
+        public static string NormalizeCountryCode(string? countryCode)
+        {
+            return (countryCode ?? string.Empty).Trim().ToLowerInvariant();
+        }
+
+        public static PerformerCodeInputValidation? GetRule(string? countryCode)
+        {
+            var normalized = NormalizeCountryCode(countryCode);
+            foreach (var rule in Rules)
+            {
+                if (string.Equals(rule.CountryCode, normalized, StringComparison.Ordinal))
+                {
+                    return rule;
+                }
+            }
+
+            return null;
+        }
+    }
+}

src/Yavsc.Api.Client/ActivityApiClient.cs

@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Yavsc.Abstract.Workflow;
+
+namespace Yavsc.Api.Client;
+
+/// <summary>
+/// HTTP client for browsing business activities and their performers.
+/// Uses absolute URLs so it can coexist with other Yavsc clients that
+/// target a different API host on the same shared transport. The same
+/// activity payload also carries the eligible billing forms for a
+/// selected performer/activity pair.
+/// </summary>
+public sealed class ActivityApiClient
+{
+    private const string PathPrefix = "activity";
+
+    private readonly IYavscApiClient _api;
+    private readonly Uri _baseAddress;
+    private readonly Uri _avatarBaseAddress;
+
+    public ActivityApiClient(IYavscApiClient api, string businessBaseAddress, string? avatarBaseAddress = null)
+    {
+        _api = api ?? throw new ArgumentNullException(nameof(api));
+        if (string.IsNullOrEmpty(businessBaseAddress))
+            throw new ArgumentException("Base address is required.", nameof(businessBaseAddress));
+
+        _baseAddress = new Uri(businessBaseAddress, UriKind.Absolute);
+        _avatarBaseAddress = string.IsNullOrWhiteSpace(avatarBaseAddress)
+            ? _baseAddress
+            : new Uri(avatarBaseAddress, UriKind.Absolute);
+    }
+
+    public Task<List<ActivityInfo>> GetCatalogAsync(
+        string? parentCode = null,
+        CancellationToken ct = default)
+    {
+        var path = string.IsNullOrWhiteSpace(parentCode)
+            ? $"{PathPrefix}/catalog"
+            : $"{PathPrefix}/catalog?parentCode={Uri.EscapeDataString(parentCode)}";
+
+        return _api.CallAsync<List<ActivityInfo>>(HttpMethod.Get, Absolute(path), ct: ct);
+    }
+
+    public Task<List<PerformerActivity>> GetUsersAsync(
+        string activityCode,
+        CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(activityCode))
+            throw new ArgumentException("Activity code is required.", nameof(activityCode));
+
+        return _api.CallAsync<List<PerformerActivity>>(
+            HttpMethod.Get,
+            Absolute($"{PathPrefix}/{Uri.EscapeDataString(activityCode)}/users"),
+            ct: ct);
+    }
+
+    public Task<List<PerformerActivity>> GetPerformersAsync(
+        string activityCode,
+        CancellationToken ct = default)
+        => GetUsersAsync(activityCode, ct);
+
+    public string BuildAvatarXsUrl(string? userName)
+    {
+        var siteRoot = new Uri(_avatarBaseAddress, "/");
+
+        if (string.IsNullOrWhiteSpace(userName))
+        {
+            return new Uri(siteRoot, "images/Users/icon_user.xs.png").ToString();
+        }
+
+        return new Uri(siteRoot, $"avatars/{Uri.EscapeDataString(userName)}.xs.png").ToString();
+    }
+
+    private string Absolute(string relativePath) => new Uri(_baseAddress, relativePath).ToString();
+}

src/Yavsc.Api.Client/BillingApiClient.cs

@@ -0,0 +1,364 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Yavsc.Models.Billing;
+using Yavsc.Models.Haircut;
+using Yavsc;
+
+namespace Yavsc.Api.Client;
+
+/// <summary>
+/// HTTP client for posting commands to the business billing routes.
+/// Uses absolute URLs so it can coexist with blog-targeting clients on
+/// the same shared transport.
+/// </summary>
+public sealed class BillingApiClient
+{
+    private const string PathPrefix = "billing";
+
+    private readonly IYavscApiClient _api;
+    private readonly Uri _baseAddress;
+
+    public BillingApiClient(IYavscApiClient api, string businessBaseAddress)
+    {
+        _api = api ?? throw new ArgumentNullException(nameof(api));
+        if (string.IsNullOrWhiteSpace(businessBaseAddress))
+            throw new ArgumentException("Base address is required.", nameof(businessBaseAddress));
+
+        _baseAddress = new Uri(businessBaseAddress, UriKind.Absolute);
+    }
+
+    public Task CreateAsync(string billingCode, object payload, CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(billingCode))
+            throw new ArgumentException("Billing code is required.", nameof(billingCode));
+
+        return _api.CallAsync(
+            HttpMethod.Post,
+            Absolute($"{PathPrefix}/{Uri.EscapeDataString(billingCode)}"),
+            body: payload,
+            ct: ct);
+    }
+
+    public Task<List<HairPrestationDto>> GetHairPrestationsAsync(string billingCode, CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(billingCode))
+            throw new ArgumentException("Billing code is required.", nameof(billingCode));
+
+        return _api.CallAsync<List<HairPrestationDto>>(
+            HttpMethod.Get,
+            Absolute($"{PathPrefix}/{Uri.EscapeDataString(billingCode)}/prestations"),
+            ct: ct);
+    }
+
+    public async Task<List<BillingQuerySummaryDto>> GetQuerySummariesAsync(string billingCode, CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(billingCode))
+            throw new ArgumentException("Billing code is required.", nameof(billingCode));
+
+        var items = await _api.CallAsync<List<BillingQuerySummaryDto>>(
+            HttpMethod.Get,
+            Absolute($"{PathPrefix}/{Uri.EscapeDataString(billingCode)}"),
+            ct: ct) ?? new List<BillingQuerySummaryDto>();
+
+        foreach (var item in items)
+        {
+            item.BillingCode = billingCode;
+        }
+
+        return items;
+    }
+
+    public async Task<BillingQueryDetailsDto> GetQueryAsync(string billingCode, long queryId, CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(billingCode))
+            throw new ArgumentException("Billing code is required.", nameof(billingCode));
+        if (queryId <= 0)
+            throw new ArgumentOutOfRangeException(nameof(queryId));
+
+        var code = billingCode.Trim();
+        var path = Absolute($"{PathPrefix}/{Uri.EscapeDataString(code)}/{queryId}");
+
+        if (string.Equals(code, BillingCodes.Rdv, StringComparison.Ordinal))
+        {
+            var dto = await _api.CallAsync<RdvQueryResponse>(HttpMethod.Get, path, ct: ct).ConfigureAwait(false);
+            return MapRdv(dto, code);
+        }
+
+        if (string.Equals(code, BillingCodes.Brush, StringComparison.Ordinal))
+        {
+            var dto = await _api.CallAsync<HairCutQueryResponse>(HttpMethod.Get, path, ct: ct).ConfigureAwait(false);
+            return MapBrush(dto, code);
+        }
+
+        if (string.Equals(code, BillingCodes.MBrush, StringComparison.Ordinal))
+        {
+            var dto = await _api.CallAsync<HairMultiCutQueryResponse>(HttpMethod.Get, path, ct: ct).ConfigureAwait(false);
+            return MapMBrush(dto, code);
+        }
+
+        throw new NotSupportedException($"Billing code '{code}' is not supported.");
+    }
+
+    public Task UpdateAsync(string billingCode, long queryId, BillingQueryDetailsDto payload, CancellationToken ct = default)
+    {
+        if (string.IsNullOrWhiteSpace(billingCode))
+            throw new ArgumentException("Billing code is required.", nameof(billingCode));
+        if (queryId <= 0)
+            throw new ArgumentOutOfRangeException(nameof(queryId));
+        if (payload is null)
+            throw new ArgumentNullException(nameof(payload));
+
+        var code = billingCode.Trim();
+
+        return _api.CallAsync(
+            HttpMethod.Put,
+            Absolute($"{PathPrefix}/{Uri.EscapeDataString(code)}/{queryId}"),
+            body: BuildUpdatePayload(code, queryId, payload),
+            ct: ct);
+    }
+
+    private string Absolute(string relativePath) => new Uri(_baseAddress, relativePath).ToString();
+
+    private static BillingQueryDetailsDto MapRdv(RdvQueryResponse dto, string billingCode)
+    {
+        return new BillingQueryDetailsDto
+        {
+            Id = dto.Id,
+            BillingCode = billingCode,
+            ActivityCode = dto.ActivityCode ?? string.Empty,
+            PerformerId = dto.PerformerId ?? string.Empty,
+            ClientId = dto.ClientId ?? string.Empty,
+            Description = dto.Description ?? string.Empty,
+            Consent = dto.Consent,
+            EventDate = dto.EventDate,
+            Status = dto.Status,
+            Reason = dto.Reason ?? string.Empty,
+            Provisional = dto.Provisional,
+            Location = dto.Location is null
+                ? null
+                : new BillingLocationDto
+                {
+                    Address = dto.Location.Address ?? string.Empty,
+                    Latitude = dto.Location.Latitude,
+                    Longitude = dto.Location.Longitude,
+                }
+        };
+    }
+
+    private static BillingQueryDetailsDto MapBrush(HairCutQueryResponse dto, string billingCode)
+    {
+        return new BillingQueryDetailsDto
+        {
+            Id = dto.Id,
+            BillingCode = billingCode,
+            ActivityCode = dto.ActivityCode ?? string.Empty,
+            PerformerId = dto.PerformerId ?? string.Empty,
+            ClientId = dto.ClientId ?? string.Empty,
+            Description = dto.Description ?? string.Empty,
+            Consent = dto.Consent,
+            EventDate = dto.EventDate,
+            Status = dto.Status,
+            AdditionalInfo = dto.AdditionalInfo ?? string.Empty,
+            Provisional = dto.Provisional,
+            PrestationId = dto.PrestationId,
+            Location = dto.Location is null
+                ? null
+                : new BillingLocationDto
+                {
+                    Address = dto.Location.Address ?? string.Empty,
+                    Latitude = dto.Location.Latitude,
+                    Longitude = dto.Location.Longitude,
+                }
+        };
+    }
+
+    private static BillingQueryDetailsDto MapMBrush(HairMultiCutQueryResponse dto, string billingCode)
+    {
+        return new BillingQueryDetailsDto
+        {
+            Id = dto.Id,
+            BillingCode = billingCode,
+            ActivityCode = dto.ActivityCode ?? string.Empty,
+            PerformerId = dto.PerformerId ?? string.Empty,
+            ClientId = dto.ClientId ?? string.Empty,
+            Description = dto.Description ?? string.Empty,
+            Consent = dto.Consent,
+            EventDate = dto.EventDate,
+            Status = dto.Status,
+            Provisional = dto.Provisional,
+            PrestationIds = (dto.Prestations ?? new List<HairPrestationCollectionItemResponse>())
+                .Select(p => p.PrestationId)
+                .Where(id => id > 0)
+                .ToList(),
+            Location = dto.Location is null
+                ? null
+                : new BillingLocationDto
+                {
+                    Address = dto.Location.Address ?? string.Empty,
+                    Latitude = dto.Location.Latitude,
+                    Longitude = dto.Location.Longitude,
+                }
+        };
+    }
+
+    private static object BuildUpdatePayload(string billingCode, long queryId, BillingQueryDetailsDto payload)
+    {
+        if (string.Equals(billingCode, BillingCodes.Rdv, StringComparison.Ordinal))
+        {
+            if (payload.EventDate is null)
+                throw new ArgumentException("EventDate is required for Rdv.", nameof(payload));
+
+            return new
+            {
+                Id = queryId,
+                ActivityCode = payload.ActivityCode,
+                PerformerId = payload.PerformerId,
+                ClientId = payload.ClientId,
+                Consent = payload.Consent,
+                EventDate = payload.EventDate.Value,
+                Location = ToLocationPayload(payload.Location),
+                Reason = payload.Reason,
+                Status = payload.Status,
+                Provisional = payload.Provisional,
+                Description = payload.Description,
+            };
+        }
+
+        if (string.Equals(billingCode, BillingCodes.Brush, StringComparison.Ordinal))
+        {
+            if (payload.PrestationId is null || payload.PrestationId <= 0)
+                throw new ArgumentException("PrestationId is required for Brush.", nameof(payload));
+
+            return new
+            {
+                Id = queryId,
+                ActivityCode = payload.ActivityCode,
+                PerformerId = payload.PerformerId,
+                ClientId = payload.ClientId,
+                Consent = payload.Consent,
+                EventDate = payload.EventDate,
+                Location = ToLocationPayload(payload.Location),
+                PrestationId = payload.PrestationId.Value,
+                AdditionalInfo = payload.AdditionalInfo,
+                Status = payload.Status,
+                Provisional = payload.Provisional,
+                Description = payload.Description,
+            };
+        }
+
+        if (string.Equals(billingCode, BillingCodes.MBrush, StringComparison.Ordinal))
+        {
+            if (payload.EventDate is null)
+                throw new ArgumentException("EventDate is required for MBrush.", nameof(payload));
+            if (payload.PrestationIds is null || payload.PrestationIds.Count == 0)
+                throw new ArgumentException("At least one prestation is required for MBrush.", nameof(payload));
+
+            return new
+            {
+                Id = queryId,
+                ActivityCode = payload.ActivityCode,
+                PerformerId = payload.PerformerId,
+                ClientId = payload.ClientId,
+                Consent = payload.Consent,
+                EventDate = payload.EventDate.Value,
+                Location = ToLocationPayload(payload.Location),
+                Prestations = payload.PrestationIds
+                    .Where(id => id > 0)
+                    .Select(id => new { PrestationId = id })
+                    .ToList(),
+                Status = payload.Status,
+                Provisional = payload.Provisional,
+                Description = payload.Description,
+            };
+        }
+
+        throw new NotSupportedException($"Billing code '{billingCode}' is not supported.");
+    }
+
+    private static object? ToLocationPayload(BillingLocationDto? location)
+    {
+        if (location is null)
+        {
+            return null;
+        }
+
+        var payload = new Dictionary<string, object?>
+        {
+            ["Address"] = location.Address,
+        };
+
+        if (location.Latitude.HasValue)
+        {
+            payload["Latitude"] = location.Latitude.Value;
+        }
+
+        if (location.Longitude.HasValue)
+        {
+            payload["Longitude"] = location.Longitude.Value;
+        }
+
+        return payload;
+    }
+
+    private sealed class BillingLocationResponse
+    {
+        public string? Address { get; set; }
+        public double Latitude { get; set; }
+        public double Longitude { get; set; }
+    }
+
+    private sealed class RdvQueryResponse
+    {
+        public long Id { get; set; }
+        public string? ActivityCode { get; set; }
+        public string? PerformerId { get; set; }
+        public string? ClientId { get; set; }
+        public string? Description { get; set; }
+        public bool Consent { get; set; }
+        public DateTime EventDate { get; set; }
+        public QueryStatus Status { get; set; }
+        public string? Reason { get; set; }
+        public decimal? Provisional { get; set; }
+        public BillingLocationResponse? Location { get; set; }
+    }
+
+    private sealed class HairCutQueryResponse
+    {
+        public long Id { get; set; }
+        public string? ActivityCode { get; set; }
+        public string? PerformerId { get; set; }
+        public string? ClientId { get; set; }
+        public string? Description { get; set; }
+        public bool Consent { get; set; }
+        public DateTime? EventDate { get; set; }
+        public QueryStatus Status { get; set; }
+        public decimal? Provisional { get; set; }
+        public long PrestationId { get; set; }
+        public string? AdditionalInfo { get; set; }
+        public BillingLocationResponse? Location { get; set; }
+    }
+
+    private sealed class HairMultiCutQueryResponse
+    {
+        public long Id { get; set; }
+        public string? ActivityCode { get; set; }
+        public string? PerformerId { get; set; }
+        public string? ClientId { get; set; }
+        public string? Description { get; set; }
+        public bool Consent { get; set; }
+        public DateTime EventDate { get; set; }
+        public QueryStatus Status { get; set; }
+        public decimal? Provisional { get; set; }
+        public BillingLocationResponse? Location { get; set; }
+        public List<HairPrestationCollectionItemResponse>? Prestations { get; set; }
+    }
+
+    private sealed class HairPrestationCollectionItemResponse
+    {
+        public long PrestationId { get; set; }
+    }
+}

src/Yavsc.Api.Client/Dtos/BillingQueryDetailsDto.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using Yavsc;
+
+namespace Yavsc.Api.Client;
+
+/// <summary>
+/// Normalized billing-query shape used by PostIt when opening an existing
+/// command from history.
+/// </summary>
+public sealed class BillingQueryDetailsDto
+{
+    public long Id { get; set; }
+    public string BillingCode { get; set; } = string.Empty;
+    public string ActivityCode { get; set; } = string.Empty;
+    public string PerformerId { get; set; } = string.Empty;
+    public string ClientId { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public bool Consent { get; set; } = true;
+    public DateTime? EventDate { get; set; }
+    public QueryStatus Status { get; set; } = QueryStatus.Inserted;
+    public string Reason { get; set; } = string.Empty;
+    public string AdditionalInfo { get; set; } = string.Empty;
+    public decimal? Provisional { get; set; }
+    public BillingLocationDto? Location { get; set; }
+    public long? PrestationId { get; set; }
+    public List<long> PrestationIds { get; set; } = new();
+}
+
+public sealed class BillingLocationDto
+{
+    public string Address { get; set; } = string.Empty;
+    public double? Latitude { get; set; }
+    public double? Longitude { get; set; }
+}

src/Yavsc.Api.Client/Dtos/BillingQuerySummaryDto.cs

@@ -0,0 +1,23 @@
+using System;
+using Yavsc;
+
+namespace Yavsc.Api.Client;
+
+/// <summary>
+/// Lightweight billing-query projection consumed by PostIt list views.
+/// Extra JSON fields from concrete query types are ignored.
+/// </summary>
+public sealed class BillingQuerySummaryDto
+{
+    public long Id { get; set; }
+    public string BillingCode { get; set; } = string.Empty;
+    public string ActivityCode { get; set; } = string.Empty;
+    public string PerformerId { get; set; } = string.Empty;
+    public string ClientId { get; set; } = string.Empty;
+    public QueryStatus Status { get; set; }
+    public string Description { get; set; } = string.Empty;
+    public DateTime? EventDate { get; set; }
+    public string Reason { get; set; } = string.Empty;
+    public string AdditionalInfo { get; set; } = string.Empty;
+    public decimal? Provisional { get; set; }
+}

src/Yavsc.Api.Test/ActivityApiControllerTests.cs

@@ -0,0 +1,161 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using Microsoft.Extensions.DependencyInjection;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Test.Fixtures;
+using Yavsc.Tests.Shared;
+
+namespace Yavsc.Api.Test;
+
+[Collection("Yavsc Api")]
+public sealed class ActivityApiControllerTests : IClassFixture<ApiWebServerFixture>
+{
+    private readonly ApiWebServerFixture _fixture;
+
+    public ActivityApiControllerTests(ApiWebServerFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    private HttpClient NewClient(string subject = "alice", string scope = "api")
+    {
+        var handler = new HttpClientHandler
+        {
+            ServerCertificateCustomValidationCallback = (_, _, _, _) => true
+        };
+        var http = new HttpClient(handler)
+        {
+            BaseAddress = new Uri(_fixture.BaseAddress)
+        };
+        http.DefaultRequestHeaders.Authorization =
+            new AuthenticationHeaderValue("Bearer", TestTokenIssuer.Issue(subject, scope));
+        return http;
+    }
+
+    [Fact]
+    public async Task GetUsers_returns_declared_user_for_exact_activity_code()
+    {
+        _fixture.ResetAndSeedActivityGraph();
+        using var http = NewClient();
+
+        var response = await http.GetAsync("/api/v1/activity/dev/users", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+
+        var payload = await response.Content.ReadFromJsonAsync<List<PerformerActivity>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(payload);
+        Assert.Single(payload!);
+        Assert.Equal("alice", payload[0].PerformerId);
+        Assert.Equal("alice", payload[0].UserName);
+        Assert.True(payload[0].HasPerformerProfile);
+        Assert.True(payload[0].Active);
+        Assert.Equal("dev", payload[0].ActivityCode);
+    }
+
+    [Fact]
+    public async Task GetUsers_returns_user_even_when_performer_inactive()
+    {
+        _fixture.ResetAndSeedActivityGraph();
+        using (var scope = _fixture.Services.CreateScope())
+        {
+            var db = scope.ServiceProvider.GetRequiredService<Yavsc.Models.ApplicationDbContext>();
+            var performer = db.Performers.Single(p => p.PerformerId == "alice");
+            performer.Active = false;
+            db.SaveChanges();
+        }
+
+        using var http = NewClient();
+        var response = await http.GetAsync("/api/v1/activity/dev/users", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+
+        var payload = await response.Content.ReadFromJsonAsync<List<PerformerActivity>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(payload);
+        Assert.Single(payload!);
+        Assert.Equal("alice", payload[0].PerformerId);
+        Assert.False(payload[0].Active);
+    }
+
+    [Fact]
+    public async Task Catalog_and_Performers_are_consistent_for_dev_activity()
+    {
+        _fixture.ResetAndSeedActivityGraph();
+        using var http = NewClient();
+
+        var catalogResponse = await http.GetAsync("/api/v1/activity/catalog", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, catalogResponse.StatusCode);
+
+        var catalog = await catalogResponse.Content.ReadFromJsonAsync<List<ActivityInfo>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(catalog);
+
+        var dev = catalog!.Single(a => a.Code == "dev");
+        Assert.True(dev.PerformerCount > 0);
+
+        var performersResponse = await http.GetAsync("/api/v1/activity/dev/users", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, performersResponse.StatusCode);
+
+        var performers = await performersResponse.Content.ReadFromJsonAsync<List<PerformerActivity>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(performers);
+        Assert.Equal(dev.PerformerCount, performers!.Count);
+        Assert.Contains(performers, p => p.PerformerId == "alice");
+    }
+
+    [Fact]
+    public async Task Catalog_does_not_list_activity_without_declaration()
+    {
+        _fixture.ResetAndSeedActivityGraph();
+        using var http = NewClient();
+
+        var catalogResponse = await http.GetAsync("/api/v1/activity/catalog", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, catalogResponse.StatusCode);
+
+        var catalog = await catalogResponse.Content.ReadFromJsonAsync<List<ActivityInfo>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(catalog);
+        Assert.DoesNotContain(catalog!, a => a.Code == "ghost");
+        Assert.Contains(catalog!, a => a.Code == "dev");
+    }
+
+    [Fact]
+    public async Task Catalog_lists_declared_activity_even_when_performer_inactive()
+    {
+        _fixture.ResetAndSeedActivityGraph();
+        using var http = NewClient();
+
+        var catalogResponse = await http.GetAsync("/api/v1/activity/catalog", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, catalogResponse.StatusCode);
+
+        var catalog = await catalogResponse.Content.ReadFromJsonAsync<List<ActivityInfo>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(catalog);
+        Assert.Contains(catalog!, a => a.Code == "declared-only");
+
+        var response = await http.GetAsync("/api/v1/activity/declared-only/users", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        var payload = await response.Content.ReadFromJsonAsync<List<PerformerActivity>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(payload);
+        Assert.Single(payload!);
+        Assert.Equal("bob", payload[0].PerformerId);
+        Assert.Equal("bob", payload[0].UserName);
+        Assert.True(payload[0].HasPerformerProfile);
+        Assert.False(payload[0].Active);
+    }
+
+    [Fact]
+    public async Task Performers_alias_returns_same_payload_as_users_endpoint()
+    {
+        _fixture.ResetAndSeedActivityGraph();
+        using var http = NewClient();
+
+        var usersResponse = await http.GetAsync("/api/v1/activity/dev/users", TestContext.Current.CancellationToken);
+        var performersResponse = await http.GetAsync("/api/v1/activity/dev/performers", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, usersResponse.StatusCode);
+        Assert.Equal(HttpStatusCode.OK, performersResponse.StatusCode);
+
+        var usersPayload = await usersResponse.Content.ReadFromJsonAsync<List<PerformerActivity>>(TestContext.Current.CancellationToken);
+        var performersPayload = await performersResponse.Content.ReadFromJsonAsync<List<PerformerActivity>>(TestContext.Current.CancellationToken);
+
+        Assert.NotNull(usersPayload);
+        Assert.NotNull(performersPayload);
+        Assert.Equal(usersPayload!.Count, performersPayload!.Count);
+        Assert.Equal(usersPayload[0].PerformerId, performersPayload[0].PerformerId);
+        Assert.Equal(usersPayload[0].UserName, performersPayload[0].UserName);
+    }
+}

src/Yavsc.Api.Test/ApiCollection.cs

@@ -0,0 +1,6 @@
+namespace Yavsc.Api.Test;
+
+[CollectionDefinition("Yavsc Api")]
+public sealed class ApiCollection
+{
+}

src/Yavsc.Api.Test/Directory.Packages.props

@@ -0,0 +1,7 @@
+<Project>
+  <!--
+    Yavsc.Api.Test has no project-specific package versions. All
+    package versions are declared at the repository root.
+  -->
+  <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Packages.props', '$(MSBuildThisFileDirectory)../'))" />
+</Project>

src/Yavsc.Api.Test/Fixtures/ApiWebServerFixture.cs

@@ -0,0 +1,343 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.IdentityModel.Tokens;
+using Yavsc.Controllers;
+using Yavsc.Models;
+using Yavsc.Models.Haircut;
+using Yavsc.Models.Relationship;
+using Yavsc.Models.Workflow;
+using Yavsc.Tests.Shared;
+
+namespace Yavsc.Api.Test.Fixtures;
+
+public sealed class ApiWebServerFixture : WebHostFixture
+{
+    protected override int HttpsPort => 5104;
+
+    private static SqliteConnection? _sharedSqliteConnection;
+    private static readonly object _sqliteLock = new();
+
+    protected override WebApplication BuildApp(WebApplicationBuilder builder)
+    {
+        SqliteConnection sharedConnection;
+        lock (_sqliteLock)
+        {
+            if (_sharedSqliteConnection is null)
+            {
+                _sharedSqliteConnection = new SqliteConnection(
+                    "Data Source=YavscApiTests;Mode=Memory;Cache=Shared");
+                _sharedSqliteConnection.Open();
+            }
+            sharedConnection = _sharedSqliteConnection;
+        }
+
+        builder.Services.AddDbContext<ApplicationDbContext>(opt =>
+            opt.UseSqlite(sharedConnection));
+
+        builder.Services.AddControllers()
+            .AddApplicationPart(typeof(ActivityApiController).Assembly);
+
+        builder.Services.AddAuthorization();
+
+        builder.Services.AddAuthentication("Bearer")
+            .AddJwtBearer("Bearer", options =>
+            {
+                options.IncludeErrorDetails = true;
+                options.MapInboundClaims = false;
+                options.TokenValidationParameters = new TokenValidationParameters
+                {
+                    ValidateIssuer = true,
+                    ValidIssuer = TestTokenIssuer.Issuer,
+                    ValidateAudience = false,
+                    ValidateLifetime = true,
+                    ValidateIssuerSigningKey = true,
+                    IssuerSigningKey = TestTokenIssuer.SigningKey,
+                    NameClaimType = "sub",
+                    RoleClaimType = Yavsc.Constants.RoleClaimType,
+                };
+            });
+
+        return builder.Build();
+    }
+
+    protected override async Task<WebApplication> ConfigurePipelineAsync(WebApplication app)
+    {
+        app.UseDeveloperExceptionPage();
+        app.UseRouting();
+        app.UseAuthentication();
+        app.UseAuthorization();
+        app.MapControllers();
+
+        using (var scope = app.Services.CreateScope())
+        {
+            var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+            db.Database.EnsureCreated();
+        }
+
+        await Task.CompletedTask;
+        return app;
+    }
+
+    public string BaseAddress => Addresses.First(a => a.StartsWith("https://", StringComparison.Ordinal));
+
+    public void ResetAndSeedActivityGraph()
+    {
+        using var scope = Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+
+        db.Database.EnsureDeleted();
+        db.Database.EnsureCreated();
+
+        var user = new ApplicationUser
+        {
+            Id = "alice",
+            UserName = "alice",
+            Email = "alice@example.test",
+            EmailConfirmed = true,
+            FullName = "Alice",
+        };
+        db.Users.Add(user);
+
+        var location = new Location
+        {
+            Address = "1 rue du Test",
+            Latitude = 48.8566,
+            Longitude = 2.3522,
+        };
+        db.Add(location);
+        db.SaveChanges();
+
+        var activity = new Activity
+        {
+            Code = "dev",
+            Name = "Dev",
+            Hidden = false,
+            DateCreated = DateTime.UtcNow,
+            DateModified = DateTime.UtcNow,
+        };
+        db.Activities.Add(activity);
+
+        db.Activities.Add(new Activity
+        {
+            Code = "ghost",
+            Name = "Ghost",
+            Hidden = false,
+            DateCreated = DateTime.UtcNow,
+            DateModified = DateTime.UtcNow,
+        });
+
+        var performer = new PerformerProfile
+        {
+            PerformerId = "alice",
+            SIREN = "123456789",
+            OrganizationAddressId = location.Id,
+            AcceptNotifications = true,
+            AcceptPublicContact = true,
+            Active = true,
+            Rate = 5,
+            WebSite = "https://alice.dev",
+        };
+        db.Performers.Add(performer);
+
+        db.UserActivities.Add(new UserActivity
+        {
+            UserId = "alice",
+            DoesCode = "dev",
+            Weight = 100,
+        });
+
+        db.Users.Add(new ApplicationUser
+        {
+            Id = "bob",
+            UserName = "bob",
+            Email = "bob@example.test",
+            EmailConfirmed = true,
+            FullName = "Bob",
+        });
+
+        db.Activities.Add(new Activity
+        {
+            Code = "declared-only",
+            Name = "Declared Only",
+            Hidden = false,
+            DateCreated = DateTime.UtcNow,
+            DateModified = DateTime.UtcNow,
+        });
+
+        db.Performers.Add(new PerformerProfile
+        {
+            PerformerId = "bob",
+            SIREN = "987654321",
+            OrganizationAddressId = location.Id,
+            AcceptNotifications = false,
+            AcceptPublicContact = false,
+            Active = false,
+            Rate = 0,
+            WebSite = "",
+        });
+
+        db.UserActivities.Add(new UserActivity
+        {
+            UserId = "bob",
+            DoesCode = "declared-only",
+            Weight = 10,
+        });
+
+        db.SaveChanges();
+    }
+
+    public void ResetAndSeedRdvQueryGraph()
+    {
+        ResetAndSeedActivityGraph();
+
+        using var scope = Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+
+        var location = db.Locations.Single(l => l.Address == "1 rue du Test");
+
+        db.RdvQueries.Add(new RdvQuery
+        {
+            ActivityCode = "dev",
+            ClientId = "alice",
+            PerformerId = "alice",
+            Consent = true,
+            EventDate = DateTime.UtcNow.AddDays(1),
+            Location = location,
+            Reason = "Initial rendez-vous",
+            Status = Yavsc.QueryStatus.Inserted,
+        });
+
+        db.SaveChanges();
+    }
+
+    public void ResetAndSeedHaircutGraph()
+    {
+        ResetAndSeedActivityGraph();
+
+        using var scope = Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+
+        var location = db.Locations.Single(l => l.Address == "1 rue du Test");
+
+        if (!db.Activities.Any(a => a.Code == "brush"))
+        {
+            db.Activities.Add(new Activity
+            {
+                Code = "brush",
+                Name = "Brush",
+                Hidden = false,
+                DateCreated = DateTime.UtcNow,
+                DateModified = DateTime.UtcNow,
+            });
+        }
+
+        if (!db.Activities.Any(a => a.Code == "mbrush"))
+        {
+            db.Activities.Add(new Activity
+            {
+                Code = "mbrush",
+                Name = "MBrush",
+                Hidden = false,
+                DateCreated = DateTime.UtcNow,
+                DateModified = DateTime.UtcNow,
+            });
+        }
+
+        if (!db.BrusherProfile.Any(p => p.UserId == "alice"))
+        {
+            db.BrusherProfile.Add(new BrusherProfile
+            {
+                UserId = "alice",
+                ActionDistance = 25,
+                WomenLongCutPrice = 50m,
+                WomenHalfCutPrice = 40m,
+                WomenShortCutPrice = 30m,
+                ManCutPrice = 20m,
+                KidCutPrice = 15m,
+                ShampooPrice = 5m,
+            });
+        }
+
+        var prestation1 = new HairPrestation
+        {
+            Gender = HairCutGenders.Women,
+            Length = HairLength.HalfLong,
+            Cut = true,
+            Shampoo = true,
+            Dressing = HairDressings.Brushing,
+            Tech = HairTechnos.NoTech,
+            Cares = false,
+            Taints = new List<HairTaintInstance>(),
+        };
+        var prestation2 = new HairPrestation
+        {
+            Gender = HairCutGenders.Man,
+            Length = HairLength.Short,
+            Cut = true,
+            Shampoo = false,
+            Dressing = HairDressings.Brushing,
+            Tech = HairTechnos.NoTech,
+            Cares = false,
+            Taints = new List<HairTaintInstance>(),
+        };
+
+        db.HairPrestation.AddRange(prestation1, prestation2);
+        db.SaveChanges();
+
+        db.HairCutQueries.Add(new HairCutQuery
+        {
+            ActivityCode = "brush",
+            ClientId = "alice",
+            PerformerId = "alice",
+            Consent = true,
+            EventDate = DateTime.UtcNow.AddDays(3),
+            Location = location,
+            PrestationId = prestation1.Id,
+            Prestation = prestation1,
+            AdditionalInfo = "Coupe test",
+            Status = Yavsc.QueryStatus.Inserted,
+            Description = "Haircut seed",
+        });
+
+        db.HairMultiCutQueries.Add(new HairMultiCutQuery
+        {
+            ActivityCode = "mbrush",
+            ClientId = "alice",
+            PerformerId = "alice",
+            Consent = true,
+            EventDate = DateTime.UtcNow.AddDays(4),
+            Location = location,
+            Prestations = new List<HairPrestationCollectionItem>
+            {
+                new() { PrestationId = prestation1.Id, Prestation = prestation1 },
+                new() { PrestationId = prestation2.Id, Prestation = prestation2 },
+            },
+            Status = Yavsc.QueryStatus.Inserted,
+        });
+
+        db.SaveChanges();
+    }
+
+    public override void Dispose()
+    {
+        try
+        {
+            base.Dispose();
+        }
+        finally
+        {
+            lock (_sqliteLock)
+            {
+                if (_sharedSqliteConnection is not null)
+                {
+                    _sharedSqliteConnection.Close();
+                    _sharedSqliteConnection.Dispose();
+                    _sharedSqliteConnection = null;
+                }
+            }
+        }
+    }
+}

src/Yavsc.Api.Test/HairCutQueryApiControllerTests.cs

@@ -0,0 +1,120 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.EntityFrameworkCore;
+using Yavsc.Api.Test.Fixtures;
+using Yavsc.Models;
+using Yavsc.Models.Haircut;
+using Yavsc.Models.Relationship;
+using Yavsc.Tests.Shared;
+
+namespace Yavsc.Api.Test;
+
+[Collection("Yavsc Api")]
+public sealed class HairCutQueryApiControllerTests : IClassFixture<ApiWebServerFixture>
+{
+    private readonly ApiWebServerFixture _fixture;
+
+    public HairCutQueryApiControllerTests(ApiWebServerFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    private HttpClient NewClient(string subject = "alice", string scope = "api")
+    {
+        var handler = new HttpClientHandler
+        {
+            ServerCertificateCustomValidationCallback = (_, _, _, _) => true
+        };
+
+        var http = new HttpClient(handler)
+        {
+            BaseAddress = new Uri(_fixture.BaseAddress)
+        };
+        http.DefaultRequestHeaders.Authorization =
+            new AuthenticationHeaderValue("Bearer", TestTokenIssuer.Issue(subject, scope));
+        return http;
+    }
+
+    [Fact]
+    public async Task Billing_brush_route_supports_crud()
+    {
+        _fixture.ResetAndSeedHaircutGraph();
+        using var http = NewClient();
+
+        var prestationId = await GetPrestationIdAsync();
+
+        var createPayload = new HairCutQuery
+        {
+            ActivityCode = "brush",
+            PerformerId = "alice",
+            Consent = true,
+            EventDate = DateTime.UtcNow.AddDays(5),
+            Location = new Location
+            {
+                Address = "2 rue de la Coupe",
+                Latitude = 48.8570,
+                Longitude = 2.3525,
+            },
+            PrestationId = prestationId,
+            AdditionalInfo = "Brushing test",
+            Status = QueryStatus.Inserted,
+            Description = "Haircut create",
+        };
+
+        var createResponse = await http.PostAsJsonAsync("/api/v1/billing/Brush", createPayload, TestContext.Current.CancellationToken);
+        if (createResponse.StatusCode != HttpStatusCode.Created)
+        {
+            var body = await createResponse.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+            Assert.Fail($"Unexpected status {createResponse.StatusCode}: {body}");
+        }
+
+        var created = await createResponse.Content.ReadFromJsonAsync<HairCutQuery>(TestContext.Current.CancellationToken);
+        Assert.NotNull(created);
+        Assert.NotEqual(0, created!.Id);
+        Assert.Equal("alice", created.ClientId);
+
+        var getResponse = await http.GetAsync($"/api/v1/billing/Brush/{created.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, getResponse.StatusCode);
+
+        var fetched = await getResponse.Content.ReadFromJsonAsync<HairCutQuery>(TestContext.Current.CancellationToken);
+        Assert.NotNull(fetched);
+        Assert.Equal(created.Id, fetched!.Id);
+        Assert.Equal("Brushing test", fetched.AdditionalInfo);
+
+        fetched.AdditionalInfo = "Brushing modifié";
+        var putResponse = await http.PutAsJsonAsync($"/api/v1/billing/Brush/{fetched.Id}", fetched, TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.NoContent, putResponse.StatusCode);
+
+        var deleteResponse = await http.DeleteAsync($"/api/v1/billing/Brush/{fetched.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, deleteResponse.StatusCode);
+
+        var missingResponse = await http.GetAsync($"/api/v1/billing/Brush/{fetched.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.NotFound, missingResponse.StatusCode);
+    }
+
+    [Fact]
+    public async Task Billing_brush_route_exposes_prestation_catalog()
+    {
+        _fixture.ResetAndSeedHaircutGraph();
+        using var http = NewClient();
+
+        var response = await http.GetAsync("/api/v1/billing/Brush/prestations", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+
+        var catalog = await response.Content.ReadFromJsonAsync<List<HairPrestationDto>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(catalog);
+        Assert.NotEmpty(catalog!);
+        Assert.All(catalog!, item => Assert.False(string.IsNullOrWhiteSpace(item.Title)));
+        Assert.Contains(catalog!, item => item.Title == "Femme · Cheveux mi-longs"
+            && item.Details == "Coupe · Brushing · Aucune technique spécifique · Shampoing · Sans soins");
+    }
+
+    private async Task<long> GetPrestationIdAsync()
+    {
+        using var scope = _fixture.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+        return await db.HairPrestation.Select(p => p.Id).FirstAsync(TestContext.Current.CancellationToken);
+    }
+}

src/Yavsc.Api.Test/HairMultiCutQueryApiControllerTests.cs

@@ -0,0 +1,123 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using Yavsc.Api.Test.Fixtures;
+using Yavsc.Models;
+using Yavsc.Models.Haircut;
+using Yavsc.Models.Relationship;
+using Yavsc.Tests.Shared;
+
+namespace Yavsc.Api.Test;
+
+[Collection("Yavsc Api")]
+public sealed class HairMultiCutQueryApiControllerTests : IClassFixture<ApiWebServerFixture>
+{
+    private readonly ApiWebServerFixture _fixture;
+
+    public HairMultiCutQueryApiControllerTests(ApiWebServerFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    private HttpClient NewClient(string subject = "alice", string scope = "api")
+    {
+        var handler = new HttpClientHandler
+        {
+            ServerCertificateCustomValidationCallback = (_, _, _, _) => true
+        };
+
+        var http = new HttpClient(handler)
+        {
+            BaseAddress = new Uri(_fixture.BaseAddress)
+        };
+        http.DefaultRequestHeaders.Authorization =
+            new AuthenticationHeaderValue("Bearer", TestTokenIssuer.Issue(subject, scope));
+        return http;
+    }
+
+    [Fact]
+    public async Task Billing_mbrush_route_supports_crud()
+    {
+        _fixture.ResetAndSeedHaircutGraph();
+        using var http = NewClient();
+
+        var prestationIds = await GetPrestationIdsAsync();
+
+        var createPayload = new HairMultiCutQuery
+        {
+            ActivityCode = "mbrush",
+            PerformerId = "alice",
+            Consent = true,
+            EventDate = DateTime.UtcNow.AddDays(6),
+            Location = new Location
+            {
+                Address = "3 rue du Groupe",
+                Latitude = 48.8580,
+                Longitude = 2.3530,
+            },
+            Prestations = prestationIds.Select(id => new HairPrestationCollectionItem { PrestationId = id }).ToList(),
+            Status = QueryStatus.Inserted,
+        };
+
+        var createResponse = await http.PostAsJsonAsync("/api/v1/billing/MBrush", createPayload, TestContext.Current.CancellationToken);
+        if (createResponse.StatusCode != HttpStatusCode.Created)
+        {
+            var body = await createResponse.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+            Assert.Fail($"Unexpected status {createResponse.StatusCode}: {body}");
+        }
+
+        var created = await createResponse.Content.ReadFromJsonAsync<HairMultiCutQuery>(TestContext.Current.CancellationToken);
+        Assert.NotNull(created);
+        Assert.NotEqual(0, created!.Id);
+        Assert.Equal("alice", created.ClientId);
+        Assert.Equal(2, created.Prestations.Count);
+
+        var getResponse = await http.GetAsync($"/api/v1/billing/MBrush/{created.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, getResponse.StatusCode);
+
+        var fetched = await getResponse.Content.ReadFromJsonAsync<HairMultiCutQuery>(TestContext.Current.CancellationToken);
+        Assert.NotNull(fetched);
+        Assert.Equal(created.Id, fetched!.Id);
+        Assert.Equal(2, fetched.Prestations.Count);
+
+        fetched.Status = QueryStatus.Accepted;
+        var putResponse = await http.PutAsJsonAsync($"/api/v1/billing/MBrush/{fetched.Id}", fetched, TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.NoContent, putResponse.StatusCode);
+
+        var deleteResponse = await http.DeleteAsync($"/api/v1/billing/MBrush/{fetched.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, deleteResponse.StatusCode);
+
+        var missingResponse = await http.GetAsync($"/api/v1/billing/MBrush/{fetched.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.NotFound, missingResponse.StatusCode);
+    }
+
+    [Fact]
+    public async Task Billing_mbrush_route_exposes_prestation_catalog()
+    {
+        _fixture.ResetAndSeedHaircutGraph();
+        using var http = NewClient();
+
+        var response = await http.GetAsync("/api/v1/billing/MBrush/prestations", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+
+        var catalog = await response.Content.ReadFromJsonAsync<List<HairPrestationDto>>(TestContext.Current.CancellationToken);
+        Assert.NotNull(catalog);
+        Assert.NotEmpty(catalog!);
+        Assert.All(catalog!, item => Assert.False(string.IsNullOrWhiteSpace(item.Details)));
+        Assert.Contains(catalog!, item => item.Title == "Femme · Cheveux mi-longs"
+            && item.Details == "Coupe · Brushing · Aucune technique spécifique · Shampoing · Sans soins");
+    }
+
+    private async Task<List<long>> GetPrestationIdsAsync()
+    {
+        using var scope = _fixture.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+        return await db.HairPrestation
+            .OrderBy(p => p.Id)
+            .Select(p => p.Id)
+            .Take(2)
+            .ToListAsync(TestContext.Current.CancellationToken);
+    }
+}

src/Yavsc.Api.Test/HomeControllerTests.cs

@@ -0,0 +1,69 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.FileProviders;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using Yavsc.Api.Test.Fixtures;
+using Yavsc.Controllers;
+using Yavsc.Models.Workflow;
+
+namespace Yavsc.Api.Test;
+
+[Collection("Yavsc Api")]
+public sealed class HomeControllerTests : IClassFixture<ApiWebServerFixture>
+{
+    private readonly ApiWebServerFixture _fixture;
+
+    public HomeControllerTests(ApiWebServerFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    [Fact]
+    public async Task Index_does_not_list_activity_without_declaration()
+    {
+        _fixture.ResetAndSeedActivityGraph();
+
+        using var scope = _fixture.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<Yavsc.Models.ApplicationDbContext>();
+
+        var controller = new HomeController(
+            NullLogger<HomeController>.Instance,
+            localizer: null!,
+            context: db,
+            settingsOptions: Options.Create(new SiteSettings()),
+            env: new TestEnvironment());
+
+        controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext
+            {
+                User = new ClaimsPrincipal(new ClaimsIdentity(new[]
+                {
+                    new Claim("sub", "alice"),
+                    new Claim(ClaimTypes.NameIdentifier, "alice")
+                }, "Bearer"))
+            }
+        };
+
+        var result = await controller.Index(id: null);
+        var view = Assert.IsType<ViewResult>(result);
+        var model = Assert.IsAssignableFrom<IEnumerable<Activity>>(view.Model);
+
+        Assert.Contains(model, a => a.Code == "dev");
+        Assert.DoesNotContain(model, a => a.Code == "ghost");
+    }
+
+    private sealed class TestEnvironment : IWebHostEnvironment
+    {
+        public string ApplicationName { get; set; } = "Yavsc.Api.Test";
+        public IFileProvider WebRootFileProvider { get; set; } = null!;
+        public string WebRootPath { get; set; } = string.Empty;
+        public string EnvironmentName { get; set; } = "Development";
+        public string ContentRootPath { get; set; } = string.Empty;
+        public IFileProvider ContentRootFileProvider { get; set; } = null!;
+    }
+}

src/Yavsc.Api.Test/RdvQueryApiControllerTests.cs

@@ -0,0 +1,85 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using Yavsc;
+using Yavsc.Api.Test.Fixtures;
+using Yavsc.Models.Workflow;
+using Yavsc.Tests.Shared;
+
+namespace Yavsc.Api.Test;
+
+[Collection("Yavsc Api")]
+public sealed class RdvQueryApiControllerTests : IClassFixture<ApiWebServerFixture>
+{
+    private readonly ApiWebServerFixture _fixture;
+
+    public RdvQueryApiControllerTests(ApiWebServerFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    private HttpClient NewClient(string subject = "alice", string scope = "api")
+    {
+        var handler = new HttpClientHandler
+        {
+            ServerCertificateCustomValidationCallback = (_, _, _, _) => true
+        };
+
+        var http = new HttpClient(handler)
+        {
+            BaseAddress = new Uri(_fixture.BaseAddress)
+        };
+        http.DefaultRequestHeaders.Authorization =
+            new AuthenticationHeaderValue("Bearer", TestTokenIssuer.Issue(subject, scope));
+        return http;
+    }
+
+    [Fact]
+    public async Task Billing_rdv_route_supports_crud()
+    {
+        _fixture.ResetAndSeedRdvQueryGraph();
+        using var http = NewClient();
+
+        var createPayload = new RdvQuery
+        {
+            ActivityCode = "dev",
+            PerformerId = "alice",
+            Consent = true,
+            EventDate = DateTime.UtcNow.AddDays(2),
+            Location = new Yavsc.Models.Relationship.Location
+            {
+                Address = "1 rue du Test",
+                Latitude = 48.8566,
+                Longitude = 2.3522,
+            },
+            Reason = "Second rendez-vous",
+            Status = QueryStatus.Inserted,
+        };
+
+        var createResponse = await http.PostAsJsonAsync("/api/v1/billing/Rdv", createPayload, TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.Created, createResponse.StatusCode);
+
+        var created = await createResponse.Content.ReadFromJsonAsync<RdvQuery>(TestContext.Current.CancellationToken);
+        Assert.NotNull(created);
+        Assert.NotEqual(0, created!.Id);
+        Assert.Equal("alice", created.ClientId);
+
+        var getResponse = await http.GetAsync($"/api/v1/billing/Rdv/{created.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, getResponse.StatusCode);
+
+        var fetched = await getResponse.Content.ReadFromJsonAsync<RdvQuery>(TestContext.Current.CancellationToken);
+        Assert.NotNull(fetched);
+        Assert.Equal(created.Id, fetched!.Id);
+        Assert.Equal("Second rendez-vous", fetched.Reason);
+
+        fetched.Reason = "Rendez-vous modifié";
+        var putResponse = await http.PutAsJsonAsync($"/api/v1/billing/Rdv/{fetched.Id}", fetched, TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.NoContent, putResponse.StatusCode);
+
+        var deleteResponse = await http.DeleteAsync($"/api/v1/billing/Rdv/{fetched.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.OK, deleteResponse.StatusCode);
+
+        var missingResponse = await http.GetAsync($"/api/v1/billing/Rdv/{fetched.Id}", TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.NotFound, missingResponse.StatusCode);
+    }
+}

src/Yavsc.Api.Test/Yavsc.Api.Test.csproj

@@ -0,0 +1,33 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <RootNamespace>Yavsc.Api.Test</RootNamespace>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" />
+    <PackageReference Include="xunit.v3" />
+    <PackageReference Include="xunit.v3.common" />
+    <PackageReference Include="xunit.v3.extensibility.core" />
+    <PackageReference Include="xunit.runner.visualstudio" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Yavsc.Abstract\Yavsc.Abstract.csproj" />
+    <ProjectReference Include="..\Yavsc.Server\Yavsc.Server.csproj" />
+    <ProjectReference Include="..\Yavsc.Api\Yavsc.Api.csproj" />
+    <ProjectReference Include="..\Yavsc.Org\Yavsc.Org.csproj" />
+    <ProjectReference Include="..\Yavsc.Tests.Shared\Yavsc.Tests.Shared.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+</Project>

src/Yavsc.Api/Controllers/Business/ActivityApiController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Yavsc.Abstract.Workflow;
 using Yavsc.Server.Helpers;
 using Yavsc.Models;
 using Yavsc.Models.Workflow;
@@ -8,6 +9,7 @@ using Yavsc.Models.Workflow;
 
 namespace Yavsc.Controllers
 {
+    [Authorize]
     [Produces("application/json")]
     [Route(Constants.APIPrefix + "/activity")]
     public class ActivityApiController : Controller
@@ -26,6 +28,119 @@ namespace Yavsc.Controllers
             return _context.Activities.Include(a=>a.Forms).Where( a => !a.Hidden );
         }
 
+        [HttpGet("catalog")]
+        public async Task<ActionResult<IEnumerable<ActivityInfo>>> GetCatalog(
+            CancellationToken cancellationToken,
+            [FromQuery] string parentCode = null)
+        {
+            var activities = await _context.Activities
+                .AsNoTracking()
+                .Include(a => a.Forms)
+                .Include(a => a.Children)
+                .ThenInclude(c => c.Forms)
+                .Where(a => !a.Hidden && a.ParentCode == parentCode)
+                .OrderByDescending(a => a.Rate)
+                .ToListAsync(cancellationToken);
+
+            var codes = activities
+                .Select(a => a.Code)
+                .Concat(activities.SelectMany(a => (a.Children ?? new List<Activity>())
+                    .Where(c => !c.Hidden)
+                    .Select(c => c.Code)))
+                .Where(c => !string.IsNullOrWhiteSpace(c))
+                .Distinct()
+                .ToArray();
+
+            var performerCounts = await (
+                from ua in _context.UserActivities.AsNoTracking()
+                where !string.IsNullOrWhiteSpace(ua.DoesCode) && codes.Contains(ua.DoesCode)
+                group ua by ua.DoesCode into g
+                select new
+                {
+                    Code = g.Key,
+                    Count = g.Select(x => x.UserId).Distinct().Count()
+                })
+                .ToDictionaryAsync(x => x.Code, x => x.Count, cancellationToken);
+
+            var filteredActivities = activities
+                .Where(a =>
+                    (performerCounts.TryGetValue(a.Code, out var ownCount) && ownCount > 0)
+                    || (a.Children ?? new List<Activity>())
+                        .Where(c => !c.Hidden)
+                        .Any(c => performerCounts.TryGetValue(c.Code, out var childCount) && childCount > 0))
+                .ToList();
+
+            return Ok(filteredActivities.Select(a => ToBrowseItem(a, performerCounts)).ToList());
+        }
+
+        [HttpGet("{id}/users")]
+        public async Task<ActionResult<IEnumerable<PerformerActivity>>> GetUsers(
+            [FromRoute] string id,
+            CancellationToken cancellationToken)
+        {
+            if (string.IsNullOrWhiteSpace(id))
+            {
+                return BadRequest("Activity code is required.");
+            }
+
+            var activity = await _context.Activities
+                .AsNoTracking()
+                .SingleOrDefaultAsync(a => a.Code == id, cancellationToken);
+            if (activity is null)
+            {
+                return NotFound();
+            }
+
+            var users = await QueryDeclaredUsersAsync(id, activity.Name, cancellationToken);
+
+            return Ok(users);
+        }
+
+        [HttpGet("{id}/performers")]
+        public Task<ActionResult<IEnumerable<PerformerActivity>>> GetPerformers(
+            [FromRoute] string id,
+            CancellationToken cancellationToken)
+        {
+            // Backward-compatible alias kept for existing clients.
+            return GetUsers(id, cancellationToken);
+        }
+
+        private Task<List<PerformerActivity>> QueryDeclaredUsersAsync(
+            string activityCode,
+            string activityName,
+            CancellationToken cancellationToken)
+        {
+            return (
+                from ua in _context.UserActivities.AsNoTracking()
+                join u in _context.ApplicationUser.AsNoTracking() on ua.UserId equals u.Id into users
+                from user in users.DefaultIfEmpty()
+                join p in _context.Performers.AsNoTracking() on ua.UserId equals p.PerformerId into performerProfiles
+                from performer in performerProfiles.DefaultIfEmpty()
+                where ua.DoesCode == activityCode
+                orderby user != null ? user.UserName : ua.UserId
+                select new PerformerActivity
+                {
+                    PerformerId = ua.UserId,
+                    HasPerformerProfile = performer != null,
+                    UserName = user != null ? (user.UserName ?? string.Empty) : string.Empty,
+                    Active = performer != null && performer.Active,
+                    AcceptNotifications = performer != null && performer.AcceptNotifications,
+                    AcceptPublicContact = performer != null && performer.AcceptPublicContact,
+                    WebSite = performer != null ? (performer.WebSite ?? string.Empty) : string.Empty,
+                    ActivityCode = activityCode,
+                    ActivityName = activityName,
+                    SettingsClassName = _context.Activities
+                        .Where(a => a.Code == activityCode)
+                        .Select(a => a.SettingsClassName)
+                        .FirstOrDefault() ?? string.Empty,
+                    ExtraActivityCount = _context.UserActivities
+                        .Where(x => x.UserId == ua.UserId && x.DoesCode != activityCode)
+                        .Count()
+                })
+                .Distinct()
+                .ToListAsync(cancellationToken);
+        }
+
         // GET: api/ActivityApi/5
         [HttpGet("{id}", Name = "GetActivity")]
         public async Task<IActionResult> GetActivity([FromRoute] string id)
@@ -144,5 +259,52 @@ namespace Yavsc.Controllers
         {
             return _context.Activities.Count(e => e.Code == id) > 0;
         }
+
+        private static ActivityInfo ToBrowseItem(
+            Activity activity,
+            IReadOnlyDictionary<string, int> performerCounts)
+        {
+            return new ActivityInfo
+            {
+                Code = activity.Code,
+                Name = activity.Name,
+                ParentCode = activity.ParentCode,
+                Description = activity.Description,
+                Photo = activity.Photo,
+                Rate = activity.Rate,
+                PerformerCount = performerCounts.TryGetValue(activity.Code, out var count) ? count : 0,
+                Forms = (activity.Forms ?? Enumerable.Empty<CommandForm>())
+                    .Select(f => new CommandFormSummary
+                    {
+                        Id = f.Id,
+                        ActionName = f.ActionName,
+                        Title = f.Title,
+                    })
+                    .ToList(),
+                Children = (activity.Children ?? Enumerable.Empty<Activity>())
+                    .Where(c => !c.Hidden)
+                    .Where(c => performerCounts.TryGetValue(c.Code, out var childCount) && childCount > 0)
+                    .OrderByDescending(c => c.Rate)
+                    .Select(c => new ActivityInfo
+                    {
+                        Code = c.Code,
+                        Name = c.Name,
+                        ParentCode = c.ParentCode,
+                        Description = c.Description,
+                        Photo = c.Photo,
+                        Rate = c.Rate,
+                        PerformerCount = performerCounts.TryGetValue(c.Code, out var childCount) ? childCount : 0,
+                        Forms = (c.Forms ?? Enumerable.Empty<CommandForm>())
+                            .Select(f => new CommandFormSummary
+                            {
+                                Id = f.Id,
+                                ActionName = f.ActionName,
+                                Title = f.Title,
+                            })
+                            .ToList(),
+                    })
+                    .ToList(),
+            };
+        }
     }
 }

src/Yavsc.Api/Controllers/Business/BillingController.cs

@@ -19,6 +19,7 @@ namespace Yavsc.ApiControllers
     using Yavsc.ViewModels.Auth;
     using Yavsc.Server.Helpers;
 
+    [Authorize]
     [Route(Constants.APIPrefix + "/bill"), Authorize]
     public class BillingController : Controller
     {

src/Yavsc.Api/Controllers/Business/BookQueryApiController.cs

@@ -12,6 +12,7 @@ namespace Yavsc.Controllers
     using Microsoft.EntityFrameworkCore;
     using Yavsc.Server.Helpers;
 
+    [Authorize]
     [Produces("application/json")]
     [Route(Constants.APIPrefix + "/bookquery"), Authorize("Performer")]
     public class BookQueryApiController : Controller

src/Yavsc.Api/Controllers/Business/EstimateApiController.cs

@@ -9,6 +9,7 @@ using Yavsc.Server.Helpers;
 
 namespace Yavsc.Controllers
 {
+    [Authorize]
     [Produces("application/json")]
     [Route(Constants.APIPrefix + "/estimate"), Authorize]
     public class EstimateApiController : Controller

src/Yavsc.Api/Controllers/Business/EstimateTemplatesApiController.cs

@@ -1,4 +1,5 @@
 using System.Security.Claims;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using Yavsc.Models;
@@ -7,6 +8,7 @@ using Yavsc.Server.Helpers;
 
 namespace Yavsc.Controllers
 {
+    [Authorize]
     [Produces("application/json")]
     [Route(Constants.APIPrefix + "/EstimateTemplatesApi")]
     public class EstimateTemplatesApiController : Controller

src/Yavsc.Api/Controllers/Business/FrontOfficeApiController.cs

@@ -1,3 +1,4 @@
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Yavsc.Helpers;
 using Yavsc.Models;
@@ -6,6 +7,7 @@ using Yavsc.ViewModels.FrontOffice;
 
 namespace Yavsc.ApiControllers
 {
+    [Authorize]
     [Route(Constants.APIPrefix + "/front")]
     public class FrontOfficeApiController : Controller
     {

src/Yavsc.Api/Controllers/Business/HairCutQueryApiController.cs

@@ -0,0 +1,234 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Yavsc.Models;
+using Yavsc.Models.Billing;
+using Yavsc.Models.Haircut;
+using Yavsc.Models.Relationship;
+using Yavsc.Server.Helpers;
+
+namespace Yavsc.Controllers;
+
+[Authorize]
+[Produces("application/json")]
+[Route(Constants.APIPrefix + "/billing/" + BillingCodes.Brush)]
+public class HairCutQueryApiController : Controller
+{
+    private readonly ApplicationDbContext _context;
+
+    public HairCutQueryApiController(ApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpGet]
+    public async Task<IActionResult> GetQueries(CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var queries = await _context.HairCutQueries
+            .AsNoTracking()
+            .Include(q => q.Prestation)
+            .Include(q => q.Location)
+            .Include(q => q.Client)
+            .Include(q => q.PerformerProfile)
+            .Where(q => q.ClientId == uid || q.PerformerId == uid)
+            .OrderByDescending(q => q.Id)
+            .ToListAsync(cancellationToken);
+
+        return Ok(queries);
+    }
+
+    [HttpGet("prestations")]
+    public async Task<IActionResult> GetPrestations(CancellationToken cancellationToken)
+    {
+        var prestations = await _context.HairPrestation
+            .AsNoTracking()
+            .OrderBy(p => p.Gender)
+            .ThenBy(p => p.Length)
+            .ThenBy(p => p.Tech)
+            .Select(p => ToDto(p))
+            .ToListAsync(cancellationToken);
+
+        return Ok(prestations);
+    }
+
+    [HttpGet("{id}", Name = "GetBillingHairCutQuery")]
+    public async Task<IActionResult> GetQuery([FromRoute] long id, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var query = await _context.HairCutQueries
+            .Include(q => q.Prestation)
+            .Include(q => q.Location)
+            .Include(q => q.Client)
+            .Include(q => q.PerformerProfile)
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (query is null)
+        {
+            return NotFound();
+        }
+
+        if (query.ClientId != uid && query.PerformerId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        return Ok(query);
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> PostQuery([FromBody] HairCutQuery query, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+        if (string.IsNullOrWhiteSpace(query.ClientId))
+        {
+            query.ClientId = uid;
+        }
+
+        ModelState.Remove("ClientId");
+        ModelState.Remove("Prestation");
+
+        if (query.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            ModelState.AddModelError("ClientId", "You can only create your own HairCutQuery");
+            return BadRequest(ModelState);
+        }
+
+        query.Prestation = await _context.HairPrestation
+            .SingleOrDefaultAsync(p => p.Id == query.PrestationId, cancellationToken);
+        if (query.Prestation is null)
+        {
+            ModelState.AddModelError("PrestationId", "Unknown hair prestation.");
+            return BadRequest(ModelState);
+        }
+
+        if (!ModelState.IsValid)
+        {
+            return BadRequest(ModelState);
+        }
+
+        query.Location = await ResolveLocationAsync(query.Location, cancellationToken);
+
+        _context.HairCutQueries.Add(query);
+
+        try
+        {
+            await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+        }
+        catch (DbUpdateException)
+        {
+            if (QueryExists(query.Id))
+            {
+                return Conflict();
+            }
+
+            throw;
+        }
+
+        return CreatedAtRoute("GetBillingHairCutQuery", new { id = query.Id }, query);
+    }
+
+    [HttpPut("{id}")]
+    public async Task<IActionResult> PutQuery([FromRoute] long id, [FromBody] HairCutQuery query, CancellationToken cancellationToken)
+    {
+        var existing = await _context.HairCutQueries
+            .Include(q => q.Location)
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (existing is null)
+        {
+            return NotFound();
+        }
+
+        var uid = User.GetUserId();
+        if (existing.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        var prestation = await _context.HairPrestation
+            .SingleOrDefaultAsync(p => p.Id == query.PrestationId, cancellationToken);
+        if (prestation is null)
+        {
+            ModelState.AddModelError("PrestationId", "Unknown hair prestation.");
+            return BadRequest(ModelState);
+        }
+
+        existing.ActivityCode = query.ActivityCode;
+        existing.PerformerId = query.PerformerId;
+        existing.Consent = query.Consent;
+        existing.EventDate = query.EventDate;
+        existing.AdditionalInfo = query.AdditionalInfo;
+        existing.Status = query.Status;
+        existing.Provisional = query.Provisional;
+        existing.PrestationId = prestation.Id;
+        existing.Prestation = prestation;
+        existing.Location = await ResolveLocationAsync(query.Location, cancellationToken);
+
+        await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+        return NoContent();
+    }
+
+    [HttpDelete("{id}")]
+    public async Task<IActionResult> DeleteQuery([FromRoute] long id, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var query = await _context.HairCutQueries
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (query is null)
+        {
+            return NotFound();
+        }
+
+        if (query.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        _context.HairCutQueries.Remove(query);
+        await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+
+        return Ok(query);
+    }
+
+    private async Task<Location> ResolveLocationAsync(Location candidate, CancellationToken cancellationToken)
+    {
+        if (candidate is null)
+        {
+            return null;
+        }
+
+        var existingLocation = await _context.Locations.FirstOrDefaultAsync(
+            x => x.Address == candidate.Address
+              && x.Longitude == candidate.Longitude
+              && x.Latitude == candidate.Latitude,
+            cancellationToken);
+
+        if (existingLocation is not null)
+        {
+            return existingLocation;
+        }
+
+        _context.Attach(candidate);
+        return candidate;
+    }
+
+    private bool QueryExists(long id)
+    {
+        return _context.HairCutQueries.Any(e => e.Id == id);
+    }
+
+    private static HairPrestationDto ToDto(HairPrestation prestation)
+    {
+        return new HairPrestationDto
+        {
+            Id = prestation.Id,
+            Title = prestation.GetDisplayTitle(),
+            Details = prestation.GetDisplayDetails(),
+        };
+    }
+}

src/Yavsc.Api/Controllers/Business/HairMultiCutQueryApiController.cs

@@ -0,0 +1,286 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Yavsc.Models;
+using Yavsc.Models.Billing;
+using Yavsc.Models.Haircut;
+using Yavsc.Models.Relationship;
+using Yavsc.Server.Helpers;
+
+namespace Yavsc.Controllers;
+
+[Authorize]
+[Produces("application/json")]
+[Route(Constants.APIPrefix + "/billing/" + BillingCodes.MBrush)]
+public class HairMultiCutQueryApiController : Controller
+{
+    private readonly ApplicationDbContext _context;
+
+    public HairMultiCutQueryApiController(ApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpGet]
+    public async Task<IActionResult> GetQueries(CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var queries = await _context.HairMultiCutQueries
+            .AsNoTracking()
+            .Include(q => q.Prestations)
+            .ThenInclude(p => p.Prestation)
+            .Include(q => q.Location)
+            .Include(q => q.Client)
+            .Include(q => q.PerformerProfile)
+            .Where(q => q.ClientId == uid || q.PerformerId == uid)
+            .OrderByDescending(q => q.Id)
+            .ToListAsync(cancellationToken);
+
+        return Ok(queries.Select(SanitizeForResponse).ToList());
+    }
+
+    [HttpGet("prestations")]
+    public async Task<IActionResult> GetPrestations(CancellationToken cancellationToken)
+    {
+        var prestations = await _context.HairPrestation
+            .AsNoTracking()
+            .OrderBy(p => p.Gender)
+            .ThenBy(p => p.Length)
+            .ThenBy(p => p.Tech)
+            .Select(p => new HairPrestationDto
+            {
+                Id = p.Id,
+                Title = p.GetDisplayTitle(),
+                Details = p.GetDisplayDetails()
+            })
+            .ToListAsync(cancellationToken);
+
+        return Ok(prestations);
+    }
+
+    [HttpGet("{id}", Name = "GetBillingHairMultiCutQuery")]
+    public async Task<IActionResult> GetQuery([FromRoute] long id, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var query = await _context.HairMultiCutQueries
+            .Include(q => q.Prestations)
+            .ThenInclude(p => p.Prestation)
+            .Include(q => q.Location)
+            .Include(q => q.Client)
+            .Include(q => q.PerformerProfile)
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (query is null)
+        {
+            return NotFound();
+        }
+
+        if (query.ClientId != uid && query.PerformerId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        return Ok(SanitizeForResponse(query));
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> PostQuery([FromBody] HairMultiCutQuery query, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+        if (string.IsNullOrWhiteSpace(query.ClientId))
+        {
+            query.ClientId = uid;
+        }
+
+        ModelState.Remove("ClientId");
+
+        if (query.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            ModelState.AddModelError("ClientId", "You can only create your own HairMultiCutQuery");
+            return BadRequest(ModelState);
+        }
+
+        if (query.Prestations is null || query.Prestations.Count == 0)
+        {
+            ModelState.AddModelError("Prestations", "At least one hair prestation is required.");
+            return BadRequest(ModelState);
+        }
+
+        var prestationItems = await ResolvePrestationsAsync(query.Prestations, cancellationToken);
+        if (prestationItems is null)
+        {
+            ModelState.AddModelError("Prestations", "One or more hair prestations are unknown.");
+            return BadRequest(ModelState);
+        }
+
+        if (!ModelState.IsValid)
+        {
+            return BadRequest(ModelState);
+        }
+
+        query.Prestations = prestationItems;
+        query.Location = await ResolveLocationAsync(query.Location, cancellationToken);
+        _context.HairMultiCutQueries.Add(query);
+
+        try
+        {
+            await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+        }
+        catch (DbUpdateException)
+        {
+            if (QueryExists(query.Id))
+            {
+                return Conflict();
+            }
+
+            throw;
+        }
+
+        return CreatedAtRoute("GetBillingHairMultiCutQuery", new { id = query.Id }, SanitizeForResponse(query));
+    }
+
+    [HttpPut("{id}")]
+    public async Task<IActionResult> PutQuery([FromRoute] long id, [FromBody] HairMultiCutQuery query, CancellationToken cancellationToken)
+    {
+        var existing = await _context.HairMultiCutQueries
+            .Include(q => q.Prestations)
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (existing is null)
+        {
+            return NotFound();
+        }
+
+        var uid = User.GetUserId();
+        if (existing.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        if (query.Prestations is null || query.Prestations.Count == 0)
+        {
+            ModelState.AddModelError("Prestations", "At least one hair prestation is required.");
+            return BadRequest(ModelState);
+        }
+
+        var prestationItems = await ResolvePrestationsAsync(query.Prestations, cancellationToken);
+        if (prestationItems is null)
+        {
+            ModelState.AddModelError("Prestations", "One or more hair prestations are unknown.");
+            return BadRequest(ModelState);
+        }
+
+        _context.RemoveRange(existing.Prestations);
+        existing.ActivityCode = query.ActivityCode;
+        existing.PerformerId = query.PerformerId;
+        existing.Consent = query.Consent;
+        existing.EventDate = query.EventDate;
+        existing.Status = query.Status;
+        existing.Provisional = query.Provisional;
+        existing.Prestations = prestationItems;
+        existing.Location = await ResolveLocationAsync(query.Location, cancellationToken);
+
+        await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+        return NoContent();
+    }
+
+    [HttpDelete("{id}")]
+    public async Task<IActionResult> DeleteQuery([FromRoute] long id, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var query = await _context.HairMultiCutQueries
+            .Include(q => q.Prestations)
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (query is null)
+        {
+            return NotFound();
+        }
+
+        if (query.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        _context.RemoveRange(query.Prestations);
+        _context.HairMultiCutQueries.Remove(query);
+        await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+
+        return Ok(SanitizeForResponse(query));
+    }
+
+    private async Task<List<HairPrestationCollectionItem>> ResolvePrestationsAsync(
+        IEnumerable<HairPrestationCollectionItem> requestedItems,
+        CancellationToken cancellationToken)
+    {
+        var ids = requestedItems
+            .Select(x => x.PrestationId)
+            .Where(x => x > 0)
+            .ToArray();
+
+        if (ids.Length == 0)
+        {
+            return null;
+        }
+
+        var prestations = await _context.HairPrestation
+            .Where(p => ids.Contains(p.Id))
+            .ToDictionaryAsync(p => p.Id, cancellationToken);
+
+        if (prestations.Count != ids.Distinct().Count())
+        {
+            return null;
+        }
+
+        return requestedItems
+            .Select(item => new HairPrestationCollectionItem
+            {
+                PrestationId = item.PrestationId,
+                Prestation = prestations[item.PrestationId],
+            })
+            .ToList();
+    }
+
+    private async Task<Location> ResolveLocationAsync(Location candidate, CancellationToken cancellationToken)
+    {
+        if (candidate is null)
+        {
+            return null;
+        }
+
+        var existingLocation = await _context.Locations.FirstOrDefaultAsync(
+            x => x.Address == candidate.Address
+              && x.Longitude == candidate.Longitude
+              && x.Latitude == candidate.Latitude,
+            cancellationToken);
+
+        if (existingLocation is not null)
+        {
+            return existingLocation;
+        }
+
+        _context.Attach(candidate);
+        return candidate;
+    }
+
+    private bool QueryExists(long id)
+    {
+        return _context.HairMultiCutQueries.Any(e => e.Id == id);
+    }
+
+    private static HairMultiCutQuery SanitizeForResponse(HairMultiCutQuery query)
+    {
+        if (query.Prestations is not null)
+        {
+            foreach (var item in query.Prestations)
+            {
+                item.Query = null;
+            }
+        }
+
+        return query;
+    }
+}

src/Yavsc.Api/Controllers/Business/PaymentApiController.cs

@@ -1,3 +1,4 @@
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Options;
 using Newtonsoft.Json;
@@ -6,6 +7,7 @@ using Yavsc.Models;
 
 namespace Yavsc.ApiControllers
 {
+    [Authorize]
     [Route(Constants.APIPrefix + "/payment")]
     public class PaymentApiController : Controller
     {

src/Yavsc.Api/Controllers/Business/PerformersApiController.cs

@@ -10,6 +10,7 @@ namespace Yavsc.Controllers
     using Yavsc.Helpers;
     using Yavsc.Services;
 
+    [Authorize]
     [Produces("application/json")]
     [Route(Constants.APIPrefix + "/performers")]
     public class PerformersApiController : Controller

src/Yavsc.Api/Controllers/Business/ProductApiController.cs

@@ -7,6 +7,7 @@ using Yavsc.Server.Helpers;
 
 namespace Yavsc.Controllers
 {
+    [Authorize]
     [Produces("application/json")]
     [Route(Constants.APIPrefix + "/ProductApi")]
     public class ProductApiController : Controller

src/Yavsc.Api/Controllers/Business/RdvQueryApiController.cs

@@ -0,0 +1,189 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Yavsc.Models;
+using Yavsc.Models.Billing;
+using Yavsc.Models.Workflow;
+using Yavsc.Server.Helpers;
+
+namespace Yavsc.Controllers;
+
+[Authorize]
+[Produces("application/json")]
+[Route(Constants.APIPrefix + "/billing/" + BillingCodes.Rdv)]
+public class RdvQueryApiController : Controller
+{
+    private readonly ApplicationDbContext _context;
+
+    public RdvQueryApiController(ApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpGet]
+    public async Task<IActionResult> GetQueries(CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var queries = await _context.RdvQueries
+            .AsNoTracking()
+            .Include(q => q.Location)
+            .Include(q => q.Client)
+            .Include(q => q.PerformerProfile)
+            .Where(q => q.ClientId == uid || q.PerformerId == uid)
+            .OrderByDescending(q => q.Id)
+            .ToListAsync(cancellationToken);
+
+        return Ok(queries);
+    }
+
+    [HttpGet("{id}", Name = "GetRdvQuery")]
+    public async Task<IActionResult> GetQuery([FromRoute] long id, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var query = await _context.RdvQueries
+            .Include(q => q.Location)
+            .Include(q => q.Client)
+            .Include(q => q.PerformerProfile)
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (query is null)
+        {
+            return NotFound();
+        }
+
+        if (query.ClientId != uid && query.PerformerId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        return Ok(query);
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> PostQuery([FromBody] RdvQuery query, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+        if (string.IsNullOrWhiteSpace(query.ClientId))
+        {
+            query.ClientId = uid;
+        }
+
+        ModelState.Remove("ClientId");
+
+        if (query.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            ModelState.AddModelError("ClientId", "You can only create your own RdvQuery");
+            return BadRequest(ModelState);
+        }
+
+        if (!ModelState.IsValid)
+        {
+            return BadRequest(ModelState);
+        }
+
+        if (query.Location is not null)
+        {
+            var existingLocation = await _context.Locations.FirstOrDefaultAsync(
+                x => x.Address == query.Location.Address
+                  && x.Longitude == query.Location.Longitude
+                  && x.Latitude == query.Location.Latitude,
+                cancellationToken);
+
+            if (existingLocation is not null)
+            {
+                query.Location = existingLocation;
+            }
+            else
+            {
+                _context.Attach(query.Location);
+            }
+        }
+
+        _context.RdvQueries.Add(query);
+
+        try
+        {
+            await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+        }
+        catch (DbUpdateException)
+        {
+            if (QueryExists(query.Id))
+            {
+                return Conflict();
+            }
+
+            throw;
+        }
+
+        return CreatedAtRoute("GetRdvQuery", new { id = query.Id }, query);
+    }
+
+    [HttpPut("{id}")]
+    public async Task<IActionResult> PutQuery([FromRoute] long id, [FromBody] RdvQuery query, CancellationToken cancellationToken)
+    {
+        if (!ModelState.IsValid)
+        {
+            return BadRequest(ModelState);
+        }
+
+        if (id != query.Id)
+        {
+            return BadRequest();
+        }
+
+        var uid = User.GetUserId();
+        if (query.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        _context.Entry(query).State = EntityState.Modified;
+
+        try
+        {
+            await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+        }
+        catch (DbUpdateConcurrencyException)
+        {
+            if (!QueryExists(id))
+            {
+                return NotFound();
+            }
+
+            throw;
+        }
+
+        return NoContent();
+    }
+
+    [HttpDelete("{id}")]
+    public async Task<IActionResult> DeleteQuery([FromRoute] long id, CancellationToken cancellationToken)
+    {
+        var uid = User.GetUserId();
+
+        var query = await _context.RdvQueries
+            .SingleOrDefaultAsync(q => q.Id == id, cancellationToken);
+
+        if (query is null)
+        {
+            return NotFound();
+        }
+
+        if (query.ClientId != uid && !User.IsInRole(Constants.AdminGroupName))
+        {
+            return Forbid();
+        }
+
+        _context.RdvQueries.Remove(query);
+        await _context.SaveChangesAsync(User.GetUserId(), cancellationToken);
+
+        return Ok(query);
+    }
+
+    private bool QueryExists(long id)
+    {
+        return _context.RdvQueries.Any(e => e.Id == id);
+    }
+}

src/Yavsc.Api/Controllers/accounting/AccountController.cs

@@ -2,6 +2,8 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.AspNetCore.Http;
+using ImageMagick;
 
 using Yavsc.Models;
 using Yavsc.Api.Helpers;
@@ -10,10 +12,21 @@ using System.Diagnostics;
 
 namespace Yavsc.WebApi.Controllers
 {
-    [Route("~/api/account")]
+    [Route( Constants.APIPrefix + "/account")]
     [Authorize("ApiScope")]
     public class ApiAccountController : Controller
     {
+        private const long MaxAvatarSizeBytes = 2 * 1024 * 1024;
+        private static readonly string[] AcceptedAvatarMimeTypes =
+        [
+            "image/png",
+            "image/jpeg",
+            "image/webp",
+            "image/gif",
+            "image/bmp",
+            "image/tiff",
+        ];
+
         readonly ApplicationDbContext _dbContext;
         private readonly ILogger _logger;
 
@@ -66,18 +79,97 @@ namespace Yavsc.WebApi.Controllers
         /// Updates the avatar
         /// </summary>
         /// <returns></returns>
-        [HttpPost("~/api/set-avatar")]
+        [HttpPost("set-avatar")]
         public async Task<IActionResult> SetAvatar()
         {
             var user =  await GetUserData(User.GetUserId());
-            if (Request.Form.Files.Count!=1)
-                return new BadRequestResult();
-            if (!Request.Form.Files[0].ContentType.StartsWith("image/png"))
-                return new BadRequestResult();
+            if (!Request.HasFormContentType)
+            {
+                return BadRequest(new
+                {
+                    status = "invalid_request",
+                    message = "A multipart/form-data request is required.",
+                    acceptedMimeTypes = AcceptedAvatarMimeTypes,
+                    maxFileSizeBytes = MaxAvatarSizeBytes,
+                    outputFormat = "image/png",
+                });
+            }
 
-            var info = user.ReceiveAvatar(Request.Form.Files[0]);
+            if (Request.Form.Files.Count != 1)
+            {
+                return BadRequest(new
+                {
+                    status = "invalid_file_count",
+                    message = "Exactly one file is required.",
+                    acceptedMimeTypes = AcceptedAvatarMimeTypes,
+                    maxFileSizeBytes = MaxAvatarSizeBytes,
+                    outputFormat = "image/png",
+                });
+            }
+
+            var avatarFile = Request.Form.Files[0];
+            if (avatarFile.Length <= 0)
+            {
+                return BadRequest(new
+                {
+                    status = "empty_file",
+                    message = "The uploaded file is empty.",
+                    acceptedMimeTypes = AcceptedAvatarMimeTypes,
+                    maxFileSizeBytes = MaxAvatarSizeBytes,
+                    outputFormat = "image/png",
+                });
+            }
+
+            if (avatarFile.Length > MaxAvatarSizeBytes)
+            {
+                return BadRequest(new
+                {
+                    status = "file_too_large",
+                    message = "Avatar is too large.",
+                    acceptedMimeTypes = AcceptedAvatarMimeTypes,
+                    maxFileSizeBytes = MaxAvatarSizeBytes,
+                    outputFormat = "image/png",
+                });
+            }
+
+            if (!AcceptedAvatarMimeTypes.Any(m => string.Equals(m, avatarFile.ContentType, StringComparison.OrdinalIgnoreCase)))
+            {
+                return StatusCode(StatusCodes.Status415UnsupportedMediaType, new
+                {
+                    status = "unsupported_media_type",
+                    message = "Unsupported image format.",
+                    acceptedMimeTypes = AcceptedAvatarMimeTypes,
+                    maxFileSizeBytes = MaxAvatarSizeBytes,
+                    outputFormat = "image/png",
+                });
+            }
+
+            try
+            {
+                var info = user.ReceiveAvatar(avatarFile);
                 await _dbContext.SaveChangesAsync();
-            return Ok(info);
+                return Ok(new
+                {
+                    status = "uploaded",
+                    message = "Avatar uploaded successfully.",
+                    acceptedMimeTypes = AcceptedAvatarMimeTypes,
+                    maxFileSizeBytes = MaxAvatarSizeBytes,
+                    outputFormat = "image/png",
+                    avatar = info,
+                });
+            }
+            catch (MagickException ex)
+            {
+                _logger.LogWarning(ex, "Avatar upload failed: invalid image data for user {UserId}", user.Id);
+                return BadRequest(new
+                {
+                    status = "invalid_image_data",
+                    message = "Image content could not be decoded.",
+                    acceptedMimeTypes = AcceptedAvatarMimeTypes,
+                    maxFileSizeBytes = MaxAvatarSizeBytes,
+                    outputFormat = "image/png",
+                });
+            }
         }
 
         [HttpGet("identity")]

src/Yavsc.Api/Program.cs

@@ -20,6 +20,7 @@ using Yavsc.Helpers;
 using Yavsc.Interface;
 using Yavsc.Interfaces;
 using Yavsc.Models;
+using Yavsc;
 using Yavsc.Server.Helpers;
 using Yavsc.Services;
 
@@ -32,6 +33,7 @@ internal class Program
         var builder = WebApplication.CreateBuilder(args);
 
         builder.AddConfiguration("api");
+        Config.SiteSetup = builder.Configuration.GetSection("Site").Get<SiteSettings>() ?? new SiteSettings();
 
         var services = builder.Services;
 
@@ -72,9 +74,10 @@ internal class Program
         services.AddAuthentication("Bearer")
                  .AddYavscJwtBearer(builder.Configuration);
 
+        // DbContextBuilder
         services.AddDbContext<ApplicationDbContext>(options =>
-
-           options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
+           options.UseNpgsql(builder.Configuration.GetConnectionString(
+            Yavsc.Constants.YavscConnectionStringName)));
 
         services.AddLocalization(options =>
         {

src/Yavsc.Api/appsettings-api.json

@@ -2,7 +2,8 @@
   "Site": {
     "Authority": "https://localhost:5001",
     "CorsAllowedOrigins": [
-      "https://localhost:5003"
+      "https://localhost:5003",
+      "https://yavsc.pschneider.fr"
     ]
   },
   "Logging": {

src/Yavsc.Org.Tests/NonRegression/AvatarFallbackTests.cs

@@ -0,0 +1,34 @@
+namespace Yavsc.Org.Tests.NonRegression;
+
+/// <summary>
+/// Non-regression: avatar requests under /avatars must never return 404
+/// for missing files. The pipeline falls back to static defaults under
+/// /images/Users/icon_user*.png.
+/// </summary>
+public class AvatarFallbackTests : IClassFixture<TestWebApplicationFactory>
+{
+    private readonly TestWebApplicationFactory _factory;
+
+    public AvatarFallbackTests(TestWebApplicationFactory factory)
+    {
+        _factory = factory;
+    }
+
+    [Theory]
+    [InlineData("/avatars/user-does-not-exist.png")]
+    [InlineData("/avatars/user-does-not-exist.s.png")]
+    [InlineData("/avatars/user-does-not-exist.xs.png")]
+    public async Task Missing_avatar_file_returns_default_image_instead_of_404(string path)
+    {
+        using var client = _factory.CreateClient();
+        var ct = TestContext.Current.CancellationToken;
+
+        var response = await client.GetAsync(path, ct);
+
+        Assert.Equal(System.Net.HttpStatusCode.OK, response.StatusCode);
+        Assert.Equal("image/png", response.Content.Headers.ContentType?.MediaType);
+
+        var payload = await response.Content.ReadAsByteArrayAsync(ct);
+        Assert.True(payload.Length > 0, $"Expected a non-empty fallback image for {path}.");
+    }
+}