refactor: 로그인시, pinPointId추가 및 로그 포맷 개선 (#115, #127, #129)

[doup2001]

📌 작업한 내용

핵심 기능 개선:
- 로그인 시 pinPointId 필수 전달
- 로그 출력 JSON 구조화

보안/운영성 강화:
- RBAC 권한 체계 완성
- 구조화 로그로 모니터링 개선

🔍 변경 사항

로그인 API:

POST /auth/login
{ email, password, pinPointId } → user.pinPointId 포함

로그 포맷:

{"level":"INFO","timestamp":"2026-04-22T10:45Z","service":"auth","userId":123,"action":"login"}

## 🖼️ 스크린샷

로그인 요청/응답 | 구조화 로그 출력

## 🔗 관련 이슈
#127 (pinPointId 로그인)  
#115 (로그 포맷 개선)

## ✅ 체크리스트
- [x] 권한 변경/검증 테스트 완료
- [x] pinPointId 필수 검증 로직 확인
- [x] 코드 리뷰 반영 완료

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch refactor/#127

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