🛡️ Sentinel: [HIGH] Fix SSRF/LFI vulnerability by restricting FFmpeg protocols

[seonghobae]

🚨 Severity: HIGH
💡 Vulnerability: SSRF/LFI 취약점. FFmpeg/FFprobe 실행 시 외부 프로토콜 접근 제한이 없어 악의적인 미디어 파일 분석 시 원격 코드나 내부 네트워크 데이터 유출 위험이 존재합니다.
🎯 Impact: 공격자가 악의적으로 조작된 미디어 파일(HLS 플레이리스트 등)을 업로드할 경우, 서버가 내부 서비스나 외부로 원치 않는 네트워크 요청을 보내 데이터 유출이 발생할 수 있습니다.
🔧 Fix: FFmpeg 및 FFprobe 명령어 인자에 "-protocol_whitelist", "file,crypto,data"를 명시적으로 추가하여 안전한 로컬 프로토콜만 사용하도록 제한했습니다. 또한, 입력 파일 경로 앞에 "-i" 인자를 명확하게 추가하여 명령어 인젝션을 방지했습니다.
✅ Verification: 전체 테스트 스위트를 실행하여 회귀 문제가 없음을 확인했습니다.

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PR created automatically by Jules for task 9414448873409242833 started by @seonghobae

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