[feature] 지원서 목록 조회 응답에 createdAt 추가

[seongwon030]

Summary

#1881 프론트엔드 작업에서 요청한 백엔드 연동 건입니다.

GET /api/club/application 응답의 forms[].forms[] 각 항목에 createdAt을 추가합니다.
프론트엔드 연도 상세 페이지의 최근 생성순 정렬 및 생성일 표시 기능이 이 필드를 필요로 합니다.

변경 사항

• ClubApplicationFormsResultItem에 createdAt 필드 추가
• ClubApplicationFormsRepositoryCustom의 aggregation 두 곳에 createdAt 반영
  • $project 단계
  • $group의 $push 문서 (여기가 빠지면 최종 응답에 실리지 않음)

참고

• ClubApplicationForm 엔티티에는 이미 createdAt이 있고 @Builder.Default로 생성 시점에 항상 채워집니다.
• 이 필드는 컬렉션 최초 생성 커밋(97051726)부터 존재해서 createdAt이 없는 레거시 문서는 없습니다. 따라서 $ifNull 폴백 없이 그대로 프로젝션했습니다.
• 관리자 전용 /api/admin/club/{clubId}/application은 별도 경로(AdminClubApplicationFormResponse)를 사용하며 이번 범위에 포함하지 않았습니다.

Test plan

• ./gradlew compileJava, ./gradlew compileTestJava 통과
• ClubApplyAdminServiceTest.getClubApplicationFormsIncludesCreatedAt 통과 (CI 확인 필요)

통합 테스트를 추가했습니다. createdAt과 editedAt을 서로 다른 값으로 저장한 뒤 조회해서, 두 필드가 각각 올바르게 매핑되는지 검증합니다. $project나 $push 중 하나라도 누락되면 실패합니다.

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Project	Deployment	Actions	Updated (UTC)
moadong	Ready	Preview	Aug 3, 2026 3:33pm

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📥 Commits

Reviewing files that changed from the base of the PR and between 7b5b337 and 9715195.

📒 Files selected for processing (3)

• backend/src/main/java/moadong/club/payload/dto/ClubApplicationFormsResultItem.java
• backend/src/main/java/moadong/club/repository/ClubApplicationFormsRepositoryCustom.java
• backend/src/test/java/moadong/club/service/ClubApplyAdminServiceTest.java

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Test Results

275 tests   275 ✅  34s ⏱️
 48 suites    0 💤
 48 files      0 ❌

Results for commit 9715195.

♻️ This comment has been updated with latest results.