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/app/app.dart

@@ -7,9 +7,10 @@ import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:provider/provider.dart';
-import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+import '../l10n/app_localizations.dart';
 import '../shared/design_system/theme/app_theme_sophisticated.dart';
 import '../features/authentication/presentation/bloc/auth_bloc.dart';
+import '../features/organizations/bloc/org_switcher_bloc.dart';
 import '../core/l10n/locale_provider.dart';
 import '../core/theme/theme_provider.dart';
 import '../core/di/injection.dart';
@@ -39,6 +40,9 @@ class UnionFlowApp extends StatelessWidget {
         BlocProvider(
           create: (context) => getIt<AuthBloc>()..add(const AuthStatusChecked()),
         ),
+        BlocProvider(
+          create: (context) => getIt<OrgSwitcherBloc>(),
+        ),
       ],
       child: Consumer2<LocaleProvider, ThemeProvider>(
         builder: (context, locale, theme, child) {