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

test/features/masters/customer/presentation/pages/customer_page_test.dart

@@ -7,6 +7,7 @@ import 'package:shadcn_ui/shadcn_ui.dart';
 
 import '../../../../../helpers/tester_extensions.dart';
 import 'package:superport_v2/core/common/models/paginated_result.dart';
+import 'package:superport_v2/core/navigation/route_paths.dart';
 import 'package:superport_v2/features/masters/customer/domain/entities/customer.dart';
 import 'package:superport_v2/features/masters/customer/domain/repositories/customer_repository.dart';
 import 'package:superport_v2/features/masters/customer/presentation/pages/customer_page.dart';
@@ -43,7 +44,7 @@ void main() {
     dotenv.testLoad(fileInput: 'FEATURE_CUSTOMERS_ENABLED=false\n');
 
     await tester.pumpWidget(
-      _buildApp(CustomerPage(routeUri: Uri(path: '/masters/customers'))),
+      _buildApp(CustomerPage(routeUri: Uri(path: inventoryCustomersRoutePath))),
     );
     await tester.pump();
 
@@ -89,7 +90,7 @@ void main() {
       );
 
       await tester.pumpWidget(
-        _buildApp(CustomerPage(routeUri: Uri(path: '/masters/customers'))),
+        _buildApp(CustomerPage(routeUri: Uri(path: inventoryCustomersRoutePath))),
       );
       await tester.pumpAndSettle();
 
@@ -126,7 +127,7 @@ void main() {
       );
 
       await tester.pumpWidget(
-        _buildApp(CustomerPage(routeUri: Uri(path: '/masters/customers'))),
+        _buildApp(CustomerPage(routeUri: Uri(path: inventoryCustomersRoutePath))),
       );
       await tester.pumpAndSettle();
 
@@ -159,7 +160,7 @@ void main() {
       );
 
       await tester.pumpWidget(
-        _buildApp(CustomerPage(routeUri: Uri(path: '/masters/customers'))),
+        _buildApp(CustomerPage(routeUri: Uri(path: inventoryCustomersRoutePath))),
       );
       await tester.pumpAndSettle();
 
@@ -232,7 +233,7 @@ void main() {
       });
 
       await tester.pumpWidget(
-        _buildApp(CustomerPage(routeUri: Uri(path: '/masters/customers'))),
+        _buildApp(CustomerPage(routeUri: Uri(path: inventoryCustomersRoutePath))),
       );
       await tester.pumpAndSettle();
 
@@ -297,7 +298,7 @@ void main() {
           Center(
             child: SizedBox(
               width: 320,
-              child: CustomerPage(routeUri: Uri(path: '/masters/customers')),
+              child: CustomerPage(routeUri: Uri(path: inventoryCustomersRoutePath)),
             ),
           ),
         ),