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/shared/widgets/dynamic_fab.dart

@@ -0,0 +1,43 @@
+import 'package:flutter/material.dart';
+import '../design_system/tokens/app_colors.dart';
+import '../design_system/tokens/app_typography.dart';
+
+/// UnionFlow Mobile - Composant DRY : DynamicFAB
+/// Bouton Flottant "Twitter Style" paramétrable pour les actions principales.
+class DynamicFAB extends StatelessWidget {
+  final VoidCallback onPressed;
+  final IconData icon;
+  final String? label; // Si null, c'est juste un bouton rond. Si texte, c'est un "extended" FAB.
+
+  const DynamicFAB({
+    Key? key,
+    required this.onPressed,
+    required this.icon,
+    this.label,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    if (label != null) {
+      return FloatingActionButton.extended(
+        onPressed: onPressed,
+        backgroundColor: AppColors.primaryGreen,
+        foregroundColor: Colors.white,
+        elevation: 4,
+        icon: Icon(icon, size: 20),
+        label: Text(
+          label!,
+          style: AppTypography.actionText,
+        ),
+      );
+    }
+
+    return FloatingActionButton(
+      onPressed: onPressed,
+      backgroundColor: AppColors.primaryGreen,
+      foregroundColor: Colors.white,
+      elevation: 4,
+      child: Icon(icon, size: 24),
+    );
+  }
+}