ci: PR 커밋 메시지 commitlint 검사 추가

[jeongph]

PR의 모든 커밋 메시지를 conventional commits 규칙으로 검사한다. rebase 머지가 개별 커밋을 그대로 main에 올리므로 커밋별 위생을 CI에서 강제.

• commitlint.config.mjs: pilot과 동일 규칙(한글 subject·72/50자·type-enum). rutter는 node 프로젝트가 아니라 config 파일만 둔다
• wagoid/commitlint-github-action@v6가 base..head 전체 커밋을 검사
• .gitignore 화이트리스트에 .github/·commitlint.config.mjs 추가 (CI 파일 관리 대상 편입)
• 이후 ruleset에서 commitlint 체크를 required로 지정 예정

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 09e2799 and 2ffb46d.

📒 Files selected for processing (3)

• .github/workflows/commitlint.yml
• .gitignore
• commitlint.config.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/commitlint

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