[FEAT] #221 FCM 서비스 호출 기반 알림 구현

[PBEM22]

📌 관련 이슈

• close [FEAT] FCM 서비스 호출 기반 알림 구현 #221

✨ 변경 사항

• FcmNotificationService 신규 생성 — 새 참여자 알림, 입금 확인 요청 알림, 분철글 상태 변경 알림, 배송 완료(후기 유도) 알림 4종
• OrderCreateService — 주문 생성 후 모집자에게 새 참여자 알림, 모집 완료(CLOSED) 시 참여자 전원에게 상태 변경 알림
• PaymentService — 입금 폼 제출 후 모집자에게 입금 확인 요청 알림, 입금 확인(PAID) 처리 후 전원 PAYMENT_DONE 알림
• OrderService — 배송 시작 등록 후 전원 SHIPPING 알림
• ParticipationService — 배송 완료 확인 후 해당 참여자에게 후기 유도 알림, 전체 배송 완료(DELIVERED) 시 전원 알림

📸 테스트 증명 (필수)

📚 리뷰어 참고 사항

• @Profile("!test")로 테스트 환경에서 FcmNotificationService 빈을 생성하지 않음
• @Autowired(required = false)로 optional 주입 → null 체크로 FCM 발송 실패가 트랜잭션을 롤백하지 않음
• deeplink 값은 iOS/Android 팀 확정 전까지 빈 문자열 + TODO 주석 처리

✅ 체크리스트

• 브랜치 전략(git flow)을 따랐나요? (develop -> feat/...)
• 로컬에서 빌드 및 실행이 정상적으로 되나요?
• 불필요한 주석(TODO 등)이나 더미 코드는 제거했나요?
• 컨벤션(커밋 메시지, 코드 스타일)을 지켰나요?

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: b488c05b-0578-4659-b367-abab803ca6da

📥 Commits

Reviewing files that changed from the base of the PR and between 1c790e4 and 311fd5a.

📒 Files selected for processing (6)

• src/main/java/org/sopt/poti/domain/fcmtoken/repository/FcmTokenRepository.java
• src/main/java/org/sopt/poti/domain/fcmtoken/service/FcmNotificationService.java
• src/main/java/org/sopt/poti/domain/order/service/OrderCreateService.java
• src/main/java/org/sopt/poti/domain/order/service/OrderService.java
• src/main/java/org/sopt/poti/domain/participation/service/ParticipationService.java
• src/main/java/org/sopt/poti/domain/payment/service/PaymentService.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/#221/fcm-notification

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