🛡️ Sentinel: [CRITICAL] ERD 모델의 DDL 인젝션 취약점 수정

[seonghobae]

🚨 Severity: CRITICAL
💡 Vulnerability: ERDModel의 addColumn에서 column type에 대한 검증이 없어 사용자가 임의의 문자를 포함한 타입(예: TEXT\n);\nDROP TABLE users;--)을 삽입하여 DDL을 조작할 수 있었습니다.
🎯 Impact: 공격자가 악의적인 DDL(DROP TABLE 등)을 실행하거나 SQL 문법을 파괴할 수 있습니다.
🔧 Fix: 정규식 /^[a-zA-Z0-9_(),\s]+$/ 을 사용하는 assertValidColumnType 검증 함수를 추가하고, addColumn 호출 시 검증하여 유효한 문자(영숫자, 괄호, 밑줄, 공백)만 허용하도록 수정했습니다.
✅ Verification: pnpm test src/lib/erd.test.ts를 실행하여 테스트 통과를 확인했습니다.

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PR created automatically by Jules for task 15353617119944385829 started by @seonghobae

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