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/finance_workflow/data/models/budget_model.dart

@@ -0,0 +1,100 @@
+/// Model de données Budget avec sérialisation JSON
+library budget_model;
+
+import 'package:json_annotation/json_annotation.dart';
+import '../../domain/entities/budget.dart';
+
+part 'budget_model.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class BudgetModel extends Budget {
+  @JsonKey(
+    fromJson: _linesFromJson,
+    toJson: _linesToJson,
+  )
+  @override
+  final List<BudgetLine> lines;
+
+  const BudgetModel({
+    required super.id,
+    required super.name,
+    super.description,
+    required super.organizationId,
+    required super.period,
+    required super.year,
+    super.month,
+    required super.status,
+    this.lines = const [],
+    required super.totalPlanned,
+    super.totalRealized,
+    super.currency,
+    required super.createdBy,
+    required super.createdAt,
+    super.approvedAt,
+    super.approvedBy,
+    required super.startDate,
+    required super.endDate,
+    super.metadata,
+  }) : super(lines: lines);
+
+  static List<BudgetLine> _linesFromJson(List<dynamic>? json) =>
+      json?.map((e) => BudgetLineModel.fromJson(e as Map<String, dynamic>)).toList() ?? [];
+
+  static List<Map<String, dynamic>> _linesToJson(List<BudgetLine>? lines) =>
+      lines?.map((l) => BudgetLineModel(
+            id: l.id,
+            category: l.category,
+            name: l.name,
+            description: l.description,
+            amountPlanned: l.amountPlanned,
+            amountRealized: l.amountRealized,
+            notes: l.notes,
+          ).toJson()).toList() ?? [];
+
+  factory BudgetModel.fromJson(Map<String, dynamic> json) =>
+      _$BudgetModelFromJson(json);
+
+  Map<String, dynamic> toJson() => _$BudgetModelToJson(this);
+
+  factory BudgetModel.fromEntity(Budget entity) {
+    return BudgetModel(
+      id: entity.id,
+      name: entity.name,
+      description: entity.description,
+      organizationId: entity.organizationId,
+      period: entity.period,
+      year: entity.year,
+      month: entity.month,
+      status: entity.status,
+      lines: entity.lines,
+      totalPlanned: entity.totalPlanned,
+      totalRealized: entity.totalRealized,
+      currency: entity.currency,
+      createdBy: entity.createdBy,
+      createdAt: entity.createdAt,
+      approvedAt: entity.approvedAt,
+      approvedBy: entity.approvedBy,
+      startDate: entity.startDate,
+      endDate: entity.endDate,
+      metadata: entity.metadata,
+    );
+  }
+}
+
+@JsonSerializable()
+class BudgetLineModel extends BudgetLine {
+  const BudgetLineModel({
+    required super.id,
+    required super.category,
+    required super.name,
+    super.description,
+    required super.amountPlanned,
+    super.amountRealized,
+    super.notes,
+  });
+
+  factory BudgetLineModel.fromJson(Map<String, dynamic> json) =>
+      _$BudgetLineModelFromJson(json);
+
+  Map<String, dynamic> toJson() => _$BudgetLineModelToJson(this);
+}

unionflow/unionflow-mobile-apps/lib/features/finance_workflow/data/models/transaction_approval_model.dart

@@ -0,0 +1,92 @@
+/// Model de données TransactionApproval avec sérialisation JSON
+library transaction_approval_model;
+
+import 'package:json_annotation/json_annotation.dart';
+import '../../domain/entities/transaction_approval.dart';
+
+part 'transaction_approval_model.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class TransactionApprovalModel extends TransactionApproval {
+  @JsonKey(
+    fromJson: _approversFromJson,
+    toJson: _approversToJson,
+  )
+  @override
+  final List<ApproverAction> approvers;
+
+  const TransactionApprovalModel({
+    required super.id,
+    required super.transactionId,
+    required super.transactionType,
+    required super.amount,
+    super.currency,
+    required super.requesterId,
+    required super.requesterName,
+    super.organizationId,
+    required super.requiredLevel,
+    required super.status,
+    this.approvers = const [],
+    super.rejectionReason,
+    required super.createdAt,
+    super.expiresAt,
+    super.completedAt,
+    super.metadata,
+  }) : super(approvers: approvers);
+
+  static List<ApproverAction> _approversFromJson(List<dynamic>? json) =>
+      json?.map((e) => ApproverActionModel.fromJson(e as Map<String, dynamic>)).toList() ?? [];
+
+  static List<Map<String, dynamic>> _approversToJson(List<ApproverAction>? approvers) =>
+      approvers?.map((a) => ApproverActionModel(
+            approverId: a.approverId,
+            approverName: a.approverName,
+            approverRole: a.approverRole,
+            decision: a.decision,
+            comment: a.comment,
+            decidedAt: a.decidedAt,
+          ).toJson()).toList() ?? [];
+
+  factory TransactionApprovalModel.fromJson(Map<String, dynamic> json) =>
+      _$TransactionApprovalModelFromJson(json);
+
+  Map<String, dynamic> toJson() => _$TransactionApprovalModelToJson(this);
+
+  factory TransactionApprovalModel.fromEntity(TransactionApproval entity) {
+    return TransactionApprovalModel(
+      id: entity.id,
+      transactionId: entity.transactionId,
+      transactionType: entity.transactionType,
+      amount: entity.amount,
+      currency: entity.currency,
+      requesterId: entity.requesterId,
+      requesterName: entity.requesterName,
+      organizationId: entity.organizationId,
+      requiredLevel: entity.requiredLevel,
+      status: entity.status,
+      approvers: entity.approvers,
+      rejectionReason: entity.rejectionReason,
+      createdAt: entity.createdAt,
+      expiresAt: entity.expiresAt,
+      completedAt: entity.completedAt,
+      metadata: entity.metadata,
+    );
+  }
+}
+
+@JsonSerializable()
+class ApproverActionModel extends ApproverAction {
+  const ApproverActionModel({
+    required super.approverId,
+    required super.approverName,
+    required super.approverRole,
+    required super.decision,
+    super.comment,
+    super.decidedAt,
+  });
+
+  factory ApproverActionModel.fromJson(Map<String, dynamic> json) =>
+      _$ApproverActionModelFromJson(json);
+
+  Map<String, dynamic> toJson() => _$ApproverActionModelToJson(this);
+}