[Feat] JWT 기반 회원가입/로그인 인증 구현#79

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zweadfx merged 8 commits intomainfrom

Apr 6, 2026

Commits on Apr 6, 2026

feat: add JWT authentication with signup and login (#78)
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feat: add refresh token endpoint for JWT token renewal (#78)
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fix: add email-validator dependency for Pydantic EmailStr (#78)
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fix: add email-validator dependency for Pydantic EmailStr (#78)
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fix: prevent timing attack on login and remove PII from auth logs (#78)
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fix: make SECRET_KEY required to prevent weak fallback (#78)
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fix: ensure SQLite parent directory exists before engine init (#78)
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fix: move DB table init into startup try block for error handling (#78)
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