feat: 요청 추적용 MDC traceId/userId 로깅 main에 포팅

[unam98]

작업 배경

dev에서 검증됐던 요청 추적 로깅(MdcLoggingFilter + logback-spring.xml)이 트렁크 기반 전환 콘텐츠 정합화 때 "로컬 모니터링 스택 전용"으로 오판되어 main에 없었다. 실제로는 ELK 연동 없이도 독립적으로 동작하는(콘솔+파일 appender만 사용) 순수 로깅 기능이라 포팅한다.

변경 사항

영역	내용
config/logging/MdcLoggingFilter.java (신규)	요청마다 8자리 traceId 발급 + JWT 헤더로 best-effort userId 채움, finally에서 반드시 MDC.remove (톰캣 스레드 재사용 시 이전 요청 값 누수 방지)
resources/logback-spring.xml (신규)	로그 패턴에 %X{traceId} 포함, Console + RollingFile(30일 보관, gzip 압축) appender
common/resolver/userId/UserIdResolver.java	실제 인증 검증을 거친 요청은 이 클래스가 더 정확한 userId로 MDC 값을 덮어쓰도록 MDC.put 추가
common/resolver/userId/UserIdResolverTest.java	MDC에 값이 채워지는지 검증하는 assertion 추가, 테스트 격리를 위한 @AfterEach MDC.clear()

영향 범위

• 로그 출력 포맷/보관 방식만 바뀜 — API 응답/비즈니스 로직 변화 없음
• ./logs 디렉터리에 롤링 로그 파일이 쌓이기 시작함 (30일 보관 후 자동 삭제)

Test Plan

• 로컬 postgres/redis 기동 후 ./gradlew test 전체 254/254 통과
• 로컬 실행 로그에서 [traceId] [userId=] 패턴이 실제로 찍히는 것 확인

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📥 Commits

Reviewing files that changed from the base of the PR and between a54fb2a and ba94500.

📒 Files selected for processing (6)

• .github/workflows/prod-cd.yml
• .github/workflows/prod-ci.yml
• src/main/java/org/runnect/server/common/resolver/userId/UserIdResolver.java
• src/main/java/org/runnect/server/config/logging/MdcLoggingFilter.java
• src/main/resources/logback-spring.xml
• src/test/java/org/runnect/server/common/resolver/userId/UserIdResolverTest.java

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