[Feat] 컬렉션·권한·사용자 목록 조회 API 추가

[Gimini-3]

변경 내용

• 컬렉션 문서 목록을 페이지 조회하고 개별 문서 읽기 권한이 없는 항목은 데이터와 전체 개수에서 제외합니다.
• 문서·컬렉션에 직접 부여된 권한 목록을 자원 ADMIN 권한으로 조회합니다.
• 관리자 사용자 목록에 이름·이메일 검색, 부서·상태 필터, 역할 목록과 페이지네이션을 추가합니다.

배경 및 영향

컬렉션 구성, 권한 관리, 사용자 관리 화면에서 필요한 조회 계약을 제공합니다. 계산·상속 권한은 기존 /me API가 계속 담당하며, 사용자 목록은 기본적으로 DELETED 계정을 제외합니다.

검증

• PostgreSQL 통합 테스트를 포함한 백엔드 전체 797개 테스트 통과
• ./gradlew build -x test 통과
• git diff --check 통과

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📥 Commits

Reviewing files that changed from the base of the PR and between 8ec86d7 and 9941794.

📒 Files selected for processing (22)

• backend/src/main/java/com/opensource/docgrid/domain/collection/controller/CollectionController.java
• backend/src/main/java/com/opensource/docgrid/domain/collection/converter/CollectionConverter.java
• backend/src/main/java/com/opensource/docgrid/domain/collection/dto/response/CollectionDocumentListItemResponse.java
• backend/src/main/java/com/opensource/docgrid/domain/collection/repository/CollectionDocumentRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/collection/service/query/CollectionQueryService.java
• backend/src/main/java/com/opensource/docgrid/domain/permission/controller/PermissionController.java
• backend/src/main/java/com/opensource/docgrid/domain/permission/converter/PermissionConverter.java
• backend/src/main/java/com/opensource/docgrid/domain/permission/repository/CollectionPermissionRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/permission/repository/DocumentPermissionRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/permission/service/query/PermissionQueryService.java
• backend/src/main/java/com/opensource/docgrid/domain/user/controller/AdminUserController.java
• backend/src/main/java/com/opensource/docgrid/domain/user/converter/AdminUserConverter.java
• backend/src/main/java/com/opensource/docgrid/domain/user/dto/response/AdminUserResponse.java
• backend/src/main/java/com/opensource/docgrid/domain/user/repository/UserRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/user/repository/UserRoleRepository.java
• backend/src/main/java/com/opensource/docgrid/domain/user/service/query/AdminUserQueryService.java
• backend/src/test/java/com/opensource/docgrid/domain/collection/controller/CollectionControllerTest.java
• backend/src/test/java/com/opensource/docgrid/domain/collection/service/query/CollectionQueryServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/permission/controller/PermissionControllerTest.java
• backend/src/test/java/com/opensource/docgrid/domain/permission/service/query/PermissionQueryServiceTest.java
• backend/src/test/java/com/opensource/docgrid/domain/user/controller/AdminUserControllerTest.java
• backend/src/test/java/com/opensource/docgrid/domain/user/service/query/AdminUserQueryServiceTest.java

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