feat(sprint-9 mobile 2026-04-25): feature compliance dashboard + Devise enum + selector + tests

Apporte aux compliance officers et controleurs internes l'accès mobile au tableau de bord
de conformité backend (P1-NEW-7). Et prépare la diaspora avec Devise enum + sélecteur
préférence persisté.

Feature Compliance (Clean Architecture)
- Domain : ComplianceSnapshot + ConformiteIndicateur (Equatable), helpers scoreSeverite + hasAlertesCritiques
- Data : ComplianceSnapshotModel.fromJson (parsing tolerant aux nullables), ComplianceRemoteDataSourceImpl Dio (GET /api/compliance/dashboard), ComplianceRepositoryImpl @Injectable
- Presentation : ComplianceBloc (Load/Refresh events, Initial/Loading/Loaded/Error states), ConformiteDashboardPage (Material 3, ScoreCard 0-100 colorée, 9 IndicateurTile, AlertesCard rouge si critiques)

Feature Devise
- Devise enum (10 valeurs miroirs backend, code/libelle/zone)
- fromCode tolérant casse + null/vide → XOF
- estInternationale pour AML
- DeviseSelector widget DropdownButtonFormField + readPreferred/writePreferred via FlutterSecureStorage (clé unionflow.devise.preferee)

Tests (17/17 verts)
- ComplianceSnapshot : 7 tests (scoreSeverite × 3, hasAlertesCritiques × 4)
- ComplianceSnapshotModel.fromJson : 4 tests (complet, fallbacks, string→double, indicateur invalide)
- Devise enum : 6 tests (reference, fromCode parse, fromCode null/inconnu, estInternationale × 2, intégrité valeurs)

Note : feature reporting trimestriel mobile (PDF viewer + bloc liste) reportée à un sprint
dédié — nécessite intégration pdf viewer + cache local non triviale.

lib/features/compliance/data/datasources/compliance_remote_datasource.dart

@@ -0,0 +1,38 @@
+import 'package:dio/dio.dart';
+import 'package:injectable/injectable.dart';
+import '../../../../core/error/exceptions.dart';
+import '../../../../core/network/api_client.dart';
+import '../../../../core/utils/logger.dart';
+import '../models/compliance_snapshot_model.dart';
+
+abstract class ComplianceRemoteDataSource {
+  /// GET /api/compliance/dashboard — snapshot pour l'organisation active.
+  Future<ComplianceSnapshotModel> getSnapshotCurrent();
+}
+
+@Injectable(as: ComplianceRemoteDataSource)
+class ComplianceRemoteDataSourceImpl implements ComplianceRemoteDataSource {
+  final ApiClient apiClient;
+
+  ComplianceRemoteDataSourceImpl(this.apiClient);
+
+  @override
+  Future<ComplianceSnapshotModel> getSnapshotCurrent() async {
+    try {
+      final response = await apiClient.get('/api/compliance/dashboard');
+      if (response.statusCode == 200 && response.data is Map<String, dynamic>) {
+        return ComplianceSnapshotModel.fromJson(
+          response.data as Map<String, dynamic>,
+        );
+      }
+      throw ServerException('Compliance snapshot HTTP ${response.statusCode}');
+    } on DioException catch (e) {
+      AppLogger.error('ComplianceRemoteDataSource: getSnapshotCurrent', error: e);
+      rethrow;
+    } catch (e, st) {
+      AppLogger.error('ComplianceRemoteDataSource: getSnapshotCurrent',
+          error: e, stackTrace: st);
+      rethrow;
+    }
+  }
+}