feat(menu-permissions): 메뉴 API 연동으로 사이드바 권한 정비

- .env.development.example과 lib/core/config/environment.dart, lib/core/permissions/permission_manager.dart에서 PERMISSION__ 폴백을 view 전용으로 좁히고 기본 정책을 명시적으로 거부하도록 재정비했다

- lib/core/navigation/*, lib/core/routing/app_router.dart, lib/widgets/app_shell.dart, lib/main.dart에서 메뉴 매니페스트·카탈로그를 도입해 /menus 응답을 캐싱하고 라우터·사이드바·Breadcrumb가 동일 menu_code/route_path를 쓰도록 리팩터링했다

- lib/core/permissions/permission_resources.dart와 그룹 권한/메뉴 마스터 모듈을 menu_code 기반 CRUD 및 Catalog 경로 정합성 검사로 전환하고 PermissionSynchronizer·PermissionBootstrapper를 확장했다

- test/helpers/test_permissions.dart, test/widgets/app_shell_test.dart 등 신규 구조를 반영하는 테스트·골든과 doc/frontend_menu_permission_tasks.md 문서를 보강했다

lib/features/masters/group_permission/presentation/pages/group_permission_page.dart

@@ -3,7 +3,9 @@ import 'package:get_it/get_it.dart';
 import 'package:intl/intl.dart' as intl;
 import 'package:shadcn_ui/shadcn_ui.dart';
 
-import 'package:superport_v2/core/constants/app_sections.dart';
+import 'package:superport_v2/core/navigation/menu_catalog.dart';
+import 'package:superport_v2/core/navigation/menu_route_definitions.dart';
+import 'package:superport_v2/core/navigation/route_paths.dart';
 import 'package:superport_v2/widgets/app_layout.dart';
 import 'package:superport_v2/widgets/components/filter_bar.dart';
 import 'package:superport_v2/widgets/components/superport_pagination_controls.dart';
@@ -24,9 +26,9 @@ import '../dialogs/group_permission_detail_dialog.dart';
 String _menuDisplayLabelFromPath(String? path, String fallback) {
   if (path != null && path.isNotEmpty) {
     final normalized = path.toLowerCase();
-    for (final page in allAppPages) {
-      if (page.path.toLowerCase() == normalized) {
-        return page.label;
+    for (final definition in menuRouteDefinitions) {
+      if (definition.routePath.toLowerCase() == normalized) {
+        return definition.defaultLabel;
       }
     }
   }
@@ -147,10 +149,12 @@ class _GroupPermissionEnabledPageState
       return;
     }
     final permissionManager = PermissionScope.of(context);
+    final menuCatalog = MenuCatalogScope.of(context);
     _controller = GroupPermissionController(
       permissionRepository: GetIt.I<GroupPermissionRepository>(),
       groupRepository: GetIt.I<GroupRepository>(),
       menuRepository: GetIt.I<MenuRepository>(),
+      menuCatalog: menuCatalog,
       permissionManager: permissionManager,
     )..addListener(_handleControllerUpdate);
     _initialized = true;
@@ -209,7 +213,10 @@ class _GroupPermissionEnabledPageState
           subtitle: '그룹별 메뉴 CRUD 권한을 체크박스로 관리합니다.',
           breadcrumbs: const [
             AppBreadcrumbItem(label: '대시보드', path: dashboardRoutePath),
-            AppBreadcrumbItem(label: '마스터', path: '/masters/group-permissions'),
+            AppBreadcrumbItem(
+              label: '마스터',
+              path: settingsGroupPermissionsRoutePath,
+            ),
             AppBreadcrumbItem(label: '그룹 권한'),
           ],
           actions: [
@@ -292,8 +299,8 @@ class _GroupPermissionEnabledPageState
               ),
               SizedBox(
                 width: 220,
-                child: ShadSelect<int?>(
-                  key: ValueKey(_controller.menuFilter),
+                child: ShadSelect<String?>(
+                  key: ValueKey<String?>(_controller.menuFilter),
                   initialValue: _controller.menuFilter,
                   placeholder: Text(
                     _controller.menus.isEmpty ? '메뉴 로딩중...' : '메뉴 전체',
@@ -305,9 +312,9 @@ class _GroupPermissionEnabledPageState
                       );
                     }
                     final menuItem = _controller.menus.firstWhere(
-                      (m) => m.id == value,
+                      (m) => m.menuCode == value,
                       orElse: () =>
-                          MenuItem(id: value, menuCode: '', menuName: ''),
+                          MenuItem(menuCode: value, menuName: '알 수 없음'),
                     );
                     return Text(_menuDisplayLabel(menuItem));
                   },
@@ -315,10 +322,13 @@ class _GroupPermissionEnabledPageState
                     _controller.updateMenuFilter(value);
                   },
                   options: [
-                    const ShadOption<int?>(value: null, child: Text('메뉴 전체')),
+                    const ShadOption<String?>(
+                      value: null,
+                      child: Text('메뉴 전체'),
+                    ),
                     ..._controller.menus.map(
-                      (menuItem) => ShadOption<int?>(
-                        value: menuItem.id,
+                      (menuItem) => ShadOption<String?>(
+                        value: menuItem.menuCode,
                         child: Text(_menuDisplayLabel(menuItem)),
                       ),
                     ),