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/features/feed/domain/entities/feed_item.dart

@@ -0,0 +1,51 @@
+import 'package:equatable/equatable.dart';
+
+enum FeedItemType { post, event, contribution, notification }
+
+/// Entité principale représentant un élément de n'importe quel flux (DRY)
+class FeedItem extends Equatable {
+  final String id;
+  final FeedItemType type;
+  final String authorName; // Nom de l'utilisateur ou de l'entité
+  final String? authorAvatarUrl;
+  final DateTime createdAt;
+  final String content;
+  
+  // Interactions sociales
+  final int likesCount;
+  final int commentsCount;
+  final bool isLikedByMe;
+  
+  // Actions spécifiques (ex: Payer, S'inscrire)
+  final String? customActionLabel;
+  final String? actionUrlTarget; // Deep link ou route
+
+  const FeedItem({
+    required this.id,
+    required this.type,
+    required this.authorName,
+    this.authorAvatarUrl,
+    required this.createdAt,
+    required this.content,
+    this.likesCount = 0,
+    this.commentsCount = 0,
+    this.isLikedByMe = false,
+    this.customActionLabel,
+    this.actionUrlTarget,
+  });
+
+  @override
+  List<Object?> get props => [
+        id,
+        type,
+        authorName,
+        authorAvatarUrl,
+        createdAt,
+        content,
+        likesCount,
+        commentsCount,
+        isLikedByMe,
+        customActionLabel,
+        actionUrlTarget,
+      ];
+}