fix(mobile): URL changement mdp corrigée + v3.0 — multi-org, AppAuth, sécurité prod

Auth:
- profile_repository.dart: /api/auth/change-password → /api/membres/auth/change-password

Multi-org (Phase 3):
- OrgSelectorPage, OrgSwitcherBloc, OrgSwitcherEntry
- org_context_service.dart: headers X-Active-Organisation-Id + X-Active-Role

Navigation:
- MorePage: navigation conditionnelle par typeOrganisation
- Suppression adaptive_navigation (remplacé par main_navigation_layout)

Auth AppAuth:
- keycloak_webview_auth_service: fixes AppAuth Android
- AuthBloc: gestion REAUTH_REQUIS + premierLoginComplet

Onboarding:
- Nouveaux états: payment_method_page, onboarding_shared_widgets
- SouscriptionStatusModel mis à jour StatutValidationSouscription

Android:
- build.gradle: ProGuard/R8, network_security_config
- Gradle wrapper mis à jour

lib/core/network/api_client.dart

@@ -10,18 +10,19 @@ import '../error/error_handler.dart';
 import '../utils/logger.dart';
 import '../../features/authentication/presentation/bloc/auth_bloc.dart';
 import '../../features/authentication/data/datasources/keycloak_auth_service.dart';
+import 'org_context_service.dart';
 
 /// Client réseau unifié basé sur Dio (Version DRY & Minimaliste).
 @lazySingleton
 class ApiClient {
   late final Dio _dio;
-  
+
   static const FlutterSecureStorage _storage = FlutterSecureStorage(
     aOptions: AndroidOptions(encryptedSharedPreferences: true),
     iOptions: IOSOptions(accessibility: KeychainAccessibility.first_unlock_this_device),
   );
 
-  ApiClient() {
+  ApiClient(OrgContextService orgContextService) {
     _dio = Dio(
       BaseOptions(
         baseUrl: AppConfig.apiBaseUrl,
@@ -53,6 +54,11 @@ class ApiClient {
           if (token != null) {
             options.headers['Authorization'] = 'Bearer $token';
           }
+          // Injecter l'organisation active si disponible
+          if (orgContextService.hasContext) {
+            options.headers[OrgContextService.headerName] =
+                orgContextService.activeOrganisationId;
+          }
           return handler.next(options);
         },
         onError: (DioException e, handler) async {