fix(API): 역할 권한 서비스 버그 수정

- RolePermissionService: Menu 모델 네임스페이스 수정
  - \App\Models\Menus\Menu → \App\Models\Commons\Menu
- RolePermissionService: 존재하지 않는 컬럼 수정
  - code, path → url
- RoleService: 커스텀 Role 모델 사용
  - Spatie\Permission\Models\Role → App\Models\Permissions\Role
- Role 모델: users() 관계 추가

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/Services/Authz/RoleService.php

@@ -5,7 +5,7 @@
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Validator;
 use Illuminate\Validation\Rule;
-use Spatie\Permission\Models\Role;
+use App\Models\Permissions\Role;
 use Spatie\Permission\PermissionRegistrar;
 
 class RoleService