Initial commit: unionflow-mobile-apps

Application Flutter complète (sans build artifacts).

Signed-off-by: lions dev Team

lib/features/finance_workflow/domain/usecases/create_budget.dart

@@ -0,0 +1,56 @@
+/// Use case: Créer un budget
+library create_budget;
+
+import 'package:dartz/dartz.dart';
+import 'package:injectable/injectable.dart';
+import '../../../../core/error/failures.dart';
+import '../entities/budget.dart';
+import '../repositories/finance_workflow_repository.dart';
+
+@lazySingleton
+class CreateBudget {
+  final FinanceWorkflowRepository repository;
+
+  CreateBudget(this.repository);
+
+  Future<Either<Failure, Budget>> call({
+    required String name,
+    String? description,
+    required String organizationId,
+    required BudgetPeriod period,
+    required int year,
+    int? month,
+    required List<BudgetLine> lines,
+  }) async {
+    // Validation
+    if (name.trim().isEmpty) {
+      return Left(ValidationFailure('Nom du budget requis'));
+    }
+
+    if (organizationId.isEmpty) {
+      return Left(ValidationFailure('ID organisation requis'));
+    }
+
+    if (year < 2000 || year > 2100) {
+      return Left(ValidationFailure('Année invalide'));
+    }
+
+    if (period == BudgetPeriod.monthly && (month == null || month < 1 || month > 12)) {
+      return Left(ValidationFailure('Mois requis pour budget mensuel (1-12)'));
+    }
+
+    if (lines.isEmpty) {
+      return Left(ValidationFailure('Au moins une ligne budgétaire requise'));
+    }
+
+    return await repository.createBudget(
+      name: name,
+      description: description,
+      organizationId: organizationId,
+      period: period,
+      year: year,
+      month: month,
+      lines: lines,
+    );
+  }
+}