🛡️ Sentinel: [CRITICAL] API 키 인증의 DoS 취약점 수정

[seonghobae]

🚨 Severity: CRITICAL
💡 Vulnerability: API 키 인증 시 non-ASCII 문자가 포함된 헤더를 전달하면 hmac.compare_digest에서 TypeError가 발생하여 500 Internal Server Error를 유발합니다.
🎯 Impact: 악의적인 사용자가 특수 문자가 포함된 인증 헤더를 대량으로 전송하여 서버를 크래시시키거나 서비스 거부(DoS) 공격을 수행할 수 있습니다.
🔧 Fix: hmac.compare_digest를 호출하기 전에 두 인자를 명시적으로 UTF-8 바이트 스트링(.encode('utf-8'))으로 인코딩하여 타입 오류를 방지했습니다.
✅ Verification: 테스트 코드 test_require_api_key_non_ascii를 추가하여 non-ASCII 문자가 포함된 헤더 처리 시 서버가 크래시되지 않고 401 오류를 반환함을 확인했습니다. 전체 테스트 스위트도 성공적으로 통과했습니다.

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PR created automatically by Jules for task 6413954989246715754 started by @seonghobae

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Reviewing files that changed from the base of the PR and between 963291f and 85c21ba.

📒 Files selected for processing (3)

• .jules/sentinel.md
• saas_web.py
• tests/test_saas_web.py

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