🛡️ Sentinel: [security improvement] 동적으로 중요 파일 제외하여 정보 노출 방지

[seonghobae]

🚨 Severity: MEDIUM
💡 Vulnerability: 디렉토리 인덱서가 .pem, .key 등 민감 파일의 기본 제외 규칙을 정적 목록에만 의존하여 정보 노출을 야기할 수 있음
🎯 Impact: 생성된 HTML이 호스팅될 경우 인증서 키 및 중요 데이터베이스 파일이 대중에 노출될 위험이 있음
🔧 Fix: process_ignore_file 에 .endsWith 검사를 추가하여 중요 확장자 파일을 동적으로 무시하도록 로직 수정
✅ Verification: ./gradlew test 로 관련 파일이 정상적으로 포함되지 않는지 검증 완료

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PR created automatically by Jules for task 7086760838869163864 started by @seonghobae

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