feat: WebSocket temps réel + Finance Workflow + corrections

- Task #6: WebSocket /ws/dashboard + Kafka events (5 topics)
  * Backend: KafkaEventProducer, KafkaEventConsumer
  * Mobile: WebSocketService (reconnection, heartbeat, typed events)
  * DashboardBloc: Auto-refresh depuis WebSocket events

- Finance Workflow: approbations + budgets (backend + mobile)
  * Backend: entities, services, resources, migrations Flyway V6
  * Mobile: features finance_workflow complète avec BLoC

- Corrections DI: interfaces IRepository partout
  * IProfileRepository, IOrganizationRepository, IMembreRepository
  * GetIt configuré avec @injectable

- Spec-Kit: constitution + templates mis à jour
  * .specify/memory/constitution.md enrichie
  * Templates agent, plan, spec, tasks, checklist

- Nettoyage: fichiers temporaires supprimés

Signed-off-by: lions dev Team

unionflow/unionflow-mobile-apps/lib/core/error/exceptions.dart

@@ -48,3 +48,27 @@ class ValidationException extends AppException {
   @override
   String toString() => 'ValidationException: $message${code != null ? ' (Code: $code)' : ''}';
 }
+
+/// Exception non autorisé (401)
+class UnauthorizedException extends AppException {
+  const UnauthorizedException([super.message = 'Non autorisé', super.code]);
+
+  @override
+  String toString() => 'UnauthorizedException: $message${code != null ? ' (Code: $code)' : ''}';
+}
+
+/// Exception non trouvé (404)
+class NotFoundException extends AppException {
+  const NotFoundException([super.message = 'Ressource non trouvée', super.code]);
+
+  @override
+  String toString() => 'NotFoundException: $message${code != null ? ' (Code: $code)' : ''}';
+}
+
+/// Exception interdit (403)
+class ForbiddenException extends AppException {
+  const ForbiddenException([super.message = 'Accès interdit', super.code]);
+
+  @override
+  String toString() => 'ForbiddenException: $message${code != null ? ' (Code: $code)' : ''}';
+}

unionflow/unionflow-mobile-apps/lib/core/error/failures.dart

@@ -4,11 +4,21 @@ import 'package:equatable/equatable.dart';
 abstract class Failure extends Equatable {
   final String message;
   final String? code;
+  final bool isRetryable;
+  final String? userFriendlyMessage;
 
-  const Failure(this.message, [this.code]);
+  const Failure(
+    this.message, [
+    this.code,
+    this.isRetryable = false,
+    this.userFriendlyMessage,
+  ]);
 
   @override
-  List<Object?> get props => [message, code];
+  List<Object?> get props => [message, code, isRetryable, userFriendlyMessage];
+
+  /// Get user-friendly message for display in UI
+  String getUserMessage() => userFriendlyMessage ?? message;
 
   @override
   String toString() => 'Failure: $message${code != null ? ' (Code: $code)' : ''}';
@@ -16,7 +26,12 @@ abstract class Failure extends Equatable {
 
 /// Échec serveur
 class ServerFailure extends Failure {
-  const ServerFailure(super.message, [super.code]);
+  const ServerFailure(
+    super.message, [
+    super.code,
+    super.isRetryable = true, // Server errors are retryable
+    super.userFriendlyMessage = 'Le serveur rencontre un problème. Veuillez réessayer.',
+  ]);
 
   @override
   String toString() => 'ServerFailure: $message${code != null ? ' (Code: $code)' : ''}';
@@ -32,7 +47,12 @@ class CacheFailure extends Failure {
 
 /// Échec de réseau
 class NetworkFailure extends Failure {
-  const NetworkFailure(super.message, [super.code]);
+  const NetworkFailure(
+    super.message, [
+    super.code,
+    super.isRetryable = true, // Network errors are retryable
+    super.userFriendlyMessage = 'Pas de connexion Internet. Vérifiez votre réseau.',
+  ]);
 
   @override
   String toString() => 'NetworkFailure: $message${code != null ? ' (Code: $code)' : ''}';
@@ -48,7 +68,12 @@ class AuthFailure extends Failure {
 
 /// Échec de validation
 class ValidationFailure extends Failure {
-  const ValidationFailure(super.message, [super.code]);
+  const ValidationFailure(
+    super.message, [
+    super.code,
+    super.isRetryable = false, // Validation errors are not retryable
+    super.userFriendlyMessage,
+  ]);
 
   @override
   String toString() => 'ValidationFailure: $message${code != null ? ' (Code: $code)' : ''}';
@@ -64,8 +89,55 @@ class PermissionFailure extends Failure {
 
 /// Échec de données non trouvées
 class NotFoundFailure extends Failure {
-  const NotFoundFailure(super.message, [super.code]);
+  const NotFoundFailure(
+    super.message, [
+    super.code,
+    super.isRetryable = false, // Not found errors are not retryable
+    super.userFriendlyMessage,
+  ]);
 
   @override
   String toString() => 'NotFoundFailure: $message${code != null ? ' (Code: $code)' : ''}';
 }
+
+/// Échec non autorisé (401)
+class UnauthorizedFailure extends Failure {
+  const UnauthorizedFailure(
+    super.message, [
+    super.code,
+    super.isRetryable = false, // Auth errors are not retryable
+    super.userFriendlyMessage = 'Votre session a expiré. Veuillez vous reconnecter.',
+  ]);
+
+  @override
+  String toString() => 'UnauthorizedFailure: $message${code != null ? ' (Code: $code)' : ''}';
+}
+
+/// Échec interdit (403)
+class ForbiddenFailure extends Failure {
+  const ForbiddenFailure(
+    super.message, [
+    super.code,
+    super.isRetryable = false, // Forbidden errors are not retryable
+    super.userFriendlyMessage = 'Vous n\'avez pas les permissions nécessaires.',
+  ]);
+
+  @override
+  String toString() => 'ForbiddenFailure: $message${code != null ? ' (Code: $code)' : ''}';
+}
+
+/// Échec inattendu
+class UnexpectedFailure extends Failure {
+  const UnexpectedFailure(super.message, [super.code]);
+
+  @override
+  String toString() => 'UnexpectedFailure: $message${code != null ? ' (Code: $code)' : ''}';
+}
+
+/// Fonctionnalité non implémentée
+class NotImplementedFailure extends Failure {
+  const NotImplementedFailure(super.message, [super.code]);
+
+  @override
+  String toString() => 'NotImplementedFailure: $message${code != null ? ' (Code: $code)' : ''}';
+}