docs(readme): 자가 가입 섹션 (#234 GA)

[bluelucifer]

README 에 자가 가입(agent-signup→제한모드→클레임) 섹션. 🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added a new section explaining self-service sign-up for instantly obtaining an API key without console registration.
  • Included example request/response details, SDK initialization guidance, and the email verification claim flow.
  • Documented limitations for unverified accounts, including restricted sending/receiving behavior and automatic deletion after 30 days.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 025152e8-f9e5-470a-8739-a8aa6b86697f

📥 Commits

Reviewing files that changed from the base of the PR and between be314bd and 09fe045.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md에 인증 없이 즉시 API 키를 받는 자가 가입 섹션이 추가되었습니다. 요청 예시, 제한 모드 사용 조건, SDK 초기화 방법, owner 검증 절차, 30일 후 자동 폐기 안내가 포함됩니다.

Changes

자가 가입 안내 문서

Layer / File(s)	Summary
자가 가입 절차 README.md	자가 가입 요청 예시, 제한 모드 사용 조건, SDK 초기화, owner 검증 절차, 30일 자동 폐기 안내가 추가되었습니다.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

나는 토끼, 깡총깡총 🐰
README 들판에 키가 반짝!
인증 없이도 길이 열리고
검증과 폐기 안내가 또렷해졌네
당근빛 문서 한 장, 폴짝 폴짝

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/selfsignup-readme

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