refactor: 총동연 월별 1위 동아리 목록 조회 API 제거

[KoSeonJe]

🚀 작업 내용

• 요구사항 삭제에 따라 총동연 월별 1위 동아리 목록 조회 API(GET /server/admin/feeds/ranking/last) 전체 제거
• 관련 Controller, Service, Repository, DTO, 테스트 코드 일괄 정리
• 다른 Admin Feed API(총동연 피드 랭킹 조회)에는 영향 없음

🤔 고민했던 내용

• FeedMonthlyRankingRepository는 스케줄러(Plan 03)에서도 사용하므로 repository 자체는 유지하고, plan 04 전용 쿼리 메서드만 제거
• GeneralFeedRankingService에서 FeedMonthlyRankingRepository 의존성이 getMonthlyWinners에서만 사용되어 필드 자체를 제거

💬 리뷰 중점사항

• 다른 API(피드 랭킹, 이달의 현황 등)에 영향이 없는지 확인 부탁드립니다

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between c7dfa5a and 07257b8.

📒 Files selected for processing (11)

• src/main/java/ddingdong/ddingdongBE/domain/feed/api/AdminFeedApi.java
• src/main/java/ddingdong/ddingdongBE/domain/feed/controller/AdminFeedController.java
• src/main/java/ddingdong/ddingdongBE/domain/feed/controller/dto/response/AdminFeedRankingWinnerResponse.java
• src/main/java/ddingdong/ddingdongBE/domain/feed/repository/FeedMonthlyRankingRepository.java
• src/main/java/ddingdong/ddingdongBE/domain/feed/service/FeedRankingService.java
• src/main/java/ddingdong/ddingdongBE/domain/feed/service/GeneralFeedRankingService.java
• src/main/java/ddingdong/ddingdongBE/domain/feed/service/dto/query/FeedRankingWinnerQuery.java
• src/test/java/ddingdong/ddingdongBE/domain/feed/controller/AdminFeedControllerE2ETest.java
• src/test/java/ddingdong/ddingdongBE/domain/feed/controller/dto/response/AdminFeedRankingWinnerResponseTest.java
• src/test/java/ddingdong/ddingdongBE/domain/feed/service/GeneralFeedRankingServiceTest.java
• src/test/java/ddingdong/ddingdongBE/domain/feed/service/dto/query/FeedRankingWinnerQueryTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/DDING-000-remove-admin-ranking-winners

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