chore: 모니터링 스택 제거

[dh2906]

🔍 개요

• 사용하지 않기로 한 OpenTelemetry 및 Prometheus/Grafana/Loki 기반 모니터링 구성을 저장소에서 제거합니다.
• /actuator/health 기반 컨테이너 healthcheck 안정성을 위해 actuator 자체는 유지하고, Prometheus 노출과 별도 monitoring 스택만 정리했습니다.

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🚀 주요 변경 내용

• Dockerfile, .env.example, stage/prod 배포 워크플로우에서 OpenTelemetry Java agent 배선과 OTEL 환경변수 예시를 제거했습니다.
• build.gradle의 Prometheus registry 의존성과 application-monitoring.yml import를 제거하고, 요청 로깅 제외 패턴은 application.yml로 이동했습니다.
• deploy-monitoring.yml 및 monitoring/ 하위 Prometheus/Grafana/Loki/Promtail 배포 자산을 제거했습니다.

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💬 참고 사항

• ./gradlew test -x checkstyleMain -x checkstyleTest, ./gradlew bootJar로 변경 영향 범위를 확인했습니다.
• ./gradlew build는 이번 변경과 무관한 기존 test checkstyle 위반 14건 때문에 실패했습니다.
• 서버에 이미 배포된 monitoring 컨테이너/볼륨은 이 PR만으로 정리되지 않으므로 별도 운영 정리가 필요합니다.

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✅ Checklist (완료 조건)

• 코드 스타일 가이드 준수
• 테스트 코드 포함됨
• Reviewers / Assignees / Labels 지정 완료
• 보안 및 민감 정보 검증 (API 키, 환경 변수, 개인정보 등)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 5341a6a2-6c38-472c-bceb-0ade4773b97e

📥 Commits

Reviewing files that changed from the base of the PR and between 1029a93 and d8d4479.

📒 Files selected for processing (16)

• .dockerignore
• .env.example
• .github/workflows/deploy-monitoring.yml
• .github/workflows/deploy-prod.yml
• .github/workflows/deploy-stage.yml
• .gitignore
• Dockerfile
• build.gradle
• monitoring/.env.example
• monitoring/docker-compose.yml
• monitoring/loki.yml
• monitoring/prometheus.yml
• monitoring/promtail.yml
• monitoring/scripts/update-backend-active-target.sh
• src/main/resources/application-monitoring.yml
• src/main/resources/application.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-observability-stack

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[github-actions]

🧪 JaCoCo Coverage Report (Changed Files)

이 PR에서 변경된 main Java 소스 파일이 없습니다.

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