[feat] 배달팟 참여 취소 API 구현

[daekyochung]

작업 내용

• 배달팟 참여 취소 API를 구현했습니다. ([feat] 배달팟 참여 취소 API 구현 #95)

변경 사항

• DELETE /api/v1/delivery-parties/{partyId}/participants 엔드포인트 추가
• 참여 여부·모집 상태·파티장 여부 검증
• 참여 상태를 CANCELED로 변경하고 취소 시각 기록
• 현재 참여 인원 응답 및 예외 응답 추가
• 참여 취소 서비스 단위 테스트 추가

리뷰 포인트

• 참여 이력 보존을 위한 소프트 취소(status=CANCELED) 처리
• 방장을 포함한 현재 참여 인원 계산 방식
• 참여 취소 엔드포인트에만 인증을 적용한 Security 설정

체크리스트

• 로컬에서 실행 확인
• Swagger 문서 갱신

Closes #95

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 7ec39ed9-fec3-481c-b860-3b8d07c5d899

📥 Commits

Reviewing files that changed from the base of the PR and between be33371 and a46bbb6.

📒 Files selected for processing (9)

• src/main/java/com/leets/tdd/global/config/JwtAuthenticationEntryPoint.java
• src/main/java/com/leets/tdd/global/config/SecurityConfig.java
• src/main/java/com/leets/tdd/party/controller/DeliveryPartyController.java
• src/main/java/com/leets/tdd/party/domain/PartyParticipant.java
• src/main/java/com/leets/tdd/party/dto/response/LeaveDeliveryPartyResponse.java
• src/main/java/com/leets/tdd/party/exception/PartyErrorCode.java
• src/main/java/com/leets/tdd/party/repository/PartyParticipantRepository.java
• src/main/java/com/leets/tdd/party/service/DeliveryPartyService.java
• src/test/java/com/leets/tdd/party/service/DeliveryPartyServiceTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/party-leave-api

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