결재 템플릿 단계 적용 구현

- ApprovalTemplate 엔티티·DTO·원격 리포지토리 추가
- ApprovalController에 템플릿 로딩/적용 상태와 assignSteps 호출 연동
- ApprovalPage 단계 탭에 템플릿 선택 UI 및 적용 확인 다이얼로그 구현
- 템플릿 적용 단위 테스트와 IMPLEMENTATION_TASKS 현황 갱신

lib/features/masters/menu/presentation/controllers/menu_controller.dart

@@ -0,0 +1,179 @@
+import 'package:flutter/foundation.dart';
+import 'package:superport_v2/core/common/models/paginated_result.dart';
+
+import '../../domain/entities/menu.dart';
+import '../../domain/repositories/menu_repository.dart';
+
+enum MenuStatusFilter { all, activeOnly, inactiveOnly }
+
+/// 메뉴 마스터 상태 컨트롤러
+///
+/// - 목록, 필터, 페이지 상태를 관리한다.
+/// - CRUD 및 복구 요청을 처리한다.
+class MenuController extends ChangeNotifier {
+  MenuController({required MenuRepository repository})
+    : _repository = repository;
+
+  final MenuRepository _repository;
+
+  PaginatedResult<MenuItem>? _result;
+  bool _isLoading = false;
+  bool _isSubmitting = false;
+  bool _isLoadingParents = false;
+  String _query = '';
+  int? _parentFilter;
+  MenuStatusFilter _statusFilter = MenuStatusFilter.all;
+  bool _includeDeleted = false;
+  String? _errorMessage;
+  List<MenuItem> _parents = const [];
+
+  PaginatedResult<MenuItem>? get result => _result;
+  bool get isLoading => _isLoading;
+  bool get isSubmitting => _isSubmitting;
+  bool get isLoadingParents => _isLoadingParents;
+  String get query => _query;
+  int? get parentFilter => _parentFilter;
+  MenuStatusFilter get statusFilter => _statusFilter;
+  bool get includeDeleted => _includeDeleted;
+  String? get errorMessage => _errorMessage;
+  List<MenuItem> get parents => _parents;
+
+  Future<void> loadParents() async {
+    _isLoadingParents = true;
+    notifyListeners();
+    try {
+      final response = await _repository.list(
+        page: 1,
+        pageSize: 200,
+        includeDeleted: false,
+      );
+      _parents = response.items;
+    } catch (e) {
+      _errorMessage = e.toString();
+    } finally {
+      _isLoadingParents = false;
+      notifyListeners();
+    }
+  }
+
+  Future<void> fetch({int page = 1}) async {
+    _isLoading = true;
+    _errorMessage = null;
+    notifyListeners();
+    try {
+      final isActive = switch (_statusFilter) {
+        MenuStatusFilter.all => null,
+        MenuStatusFilter.activeOnly => true,
+        MenuStatusFilter.inactiveOnly => false,
+      };
+      final response = await _repository.list(
+        page: page,
+        pageSize: _result?.pageSize ?? 20,
+        query: _query.isEmpty ? null : _query,
+        parentId: _parentFilter,
+        isActive: isActive,
+        includeDeleted: _includeDeleted,
+      );
+      _result = response;
+    } catch (e) {
+      _errorMessage = e.toString();
+    } finally {
+      _isLoading = false;
+      notifyListeners();
+    }
+  }
+
+  void updateQuery(String value) {
+    _query = value;
+    notifyListeners();
+  }
+
+  void updateParentFilter(int? parentId) {
+    _parentFilter = parentId;
+    notifyListeners();
+  }
+
+  void updateStatusFilter(MenuStatusFilter filter) {
+    _statusFilter = filter;
+    notifyListeners();
+  }
+
+  void updateIncludeDeleted(bool value) {
+    _includeDeleted = value;
+    notifyListeners();
+  }
+
+  Future<MenuItem?> create(MenuInput input) async {
+    _setSubmitting(true);
+    try {
+      final created = await _repository.create(input);
+      await fetch(page: 1);
+      await loadParents();
+      return created;
+    } catch (e) {
+      _errorMessage = e.toString();
+      notifyListeners();
+      return null;
+    } finally {
+      _setSubmitting(false);
+    }
+  }
+
+  Future<MenuItem?> update(int id, MenuInput input) async {
+    _setSubmitting(true);
+    try {
+      final updated = await _repository.update(id, input);
+      await fetch(page: _result?.page ?? 1);
+      await loadParents();
+      return updated;
+    } catch (e) {
+      _errorMessage = e.toString();
+      notifyListeners();
+      return null;
+    } finally {
+      _setSubmitting(false);
+    }
+  }
+
+  Future<bool> delete(int id) async {
+    _setSubmitting(true);
+    try {
+      await _repository.delete(id);
+      await fetch(page: _result?.page ?? 1);
+      await loadParents();
+      return true;
+    } catch (e) {
+      _errorMessage = e.toString();
+      notifyListeners();
+      return false;
+    } finally {
+      _setSubmitting(false);
+    }
+  }
+
+  Future<MenuItem?> restore(int id) async {
+    _setSubmitting(true);
+    try {
+      final restored = await _repository.restore(id);
+      await fetch(page: _result?.page ?? 1);
+      await loadParents();
+      return restored;
+    } catch (e) {
+      _errorMessage = e.toString();
+      notifyListeners();
+      return null;
+    } finally {
+      _setSubmitting(false);
+    }
+  }
+
+  void clearError() {
+    _errorMessage = null;
+    notifyListeners();
+  }
+
+  void _setSubmitting(bool value) {
+    _isSubmitting = value;
+    notifyListeners();
+  }
+}