chore: gitignore가 application.yml을 놓치던 문제 수정

[unam98]

작업 배경

• 로컬 테스트용 src/main/resources/application.yml을 만들다가, .gitignore의 실제 패턴이 application.yaml(확장자 yaml)만 막고 있어 application.yml(확장자 yml)은 무시 대상이 아니라는 걸 발견 (git check-ignore -v로 확인)
• 지금은 더미값뿐이라 실제 유출은 없었지만, git add -A를 실수로 돌리면 로컬 DB 자격증명 등이 커밋될 수 있는 구멍이었음

변경 사항

영역	내용
.gitignore	application.yml, src/main/resources/application.yml, src/main/resources/application.yaml 패턴 추가

영향 범위

• 설정 파일 무시 규칙만 추가, 런타임/로직 영향 없음

Test Plan

• git check-ignore -v src/main/resources/application.yml로 이제 무시됨을 확인

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📥 Commits

Reviewing files that changed from the base of the PR and between 81126d5 and 338e413.

📒 Files selected for processing (1)

• .gitignore

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