add local development runtime setup

[cfcromn]

작업 내용

• Docker Compose 기반 PostGIS/Redis 로컬 실행 환경 추가
• Spring Boot Docker Compose 개발 의존성 추가
• Actuator health endpoint 설정 추가
• application.yaml 환경변수 기반 설정 추가
• .env.example 로컬 개발 변수 추가
• .env Git 추적 제거
• HELP.md 로컬 실행 안내 추가

검증

• docker compose config
• ./gradlew test
• ./gradlew bootRun

참고

• bootRun은 Spring Boot Docker Compose 자동 기동까지 확인됐지만, 현재 로컬 Redis 6379 포트가 이미 사용 중이라 Redis publish 단계에서 실패했습니다.
• 요청에 따라 포트 충돌 회피용 기본 포트 변경은 적용하지 않았습니다.

Close #3

[gemini-code-assist]

Code Review

This pull request introduces local development configurations, including a .env.example file, Docker Compose setup for PostgreSQL (PostGIS) and Redis, Spring Boot Actuator integration, and updated local run instructions in HELP.md. Feedback includes removing default AWS credential values in application.yaml to avoid breaking production IAM authentication, adding a Gradle configuration to load .env variables during bootRun, and adding a tip in HELP.md regarding port conflict resolution.

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