docs: AI 협업 규칙 파일 추가

[ychany]

작업 내용

• AI 협업 규칙 파일 CLAUDE.md, .cursorrules 추가
• 두 파일은 동일한 내용으로 통일 (Claude Code / Cursor AI 둘 다 같은 기준 적용)
• 프로젝트 컨텍스트, 기술 스택, 프로젝트 구조, 네이밍/코딩 컨벤션 포함
• Import 규칙, ESLint 주요 규칙, Git 전략 (브랜치/커밋/PR/PN 룰) 포함

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a0297bbf-d64a-4a93-b4fc-93173ff4a2b8

📥 Commits

Reviewing files that changed from the base of the PR and between b4ae6d7 and c29f3b4.

📒 Files selected for processing (2)

• .cursorrules
• CLAUDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/ai-rules

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