Security audit confirms no secret leakage and proper enforcement

[Copilot]

Completed comprehensive security review per user request to verify no credential leaks, proper deployment safety, and security enforcement.

Audit Results

No issues found. Code is secure and deployment-safe.

Secret Enforcement ✓

• SECRET_KEY ≥32 chars and ADMIN_PASSWORD ≥12 chars validated at startup in backend/utils.py and backend/database.py
• Application terminates with ValueError if requirements unmet
• Docker Compose uses ${VAR:?error} syntax to enforce required env vars

No Credential Leakage ✓

• Zero hardcoded secrets in codebase
• All API key patterns (sk-, AIza-, etc.) are UI placeholders or .env.example templates
• .gitignore and .dockerignore properly exclude .env* files

Documentation ✓

• README provides openssl rand -base64 examples for secure key generation
• Clear warnings about strong secret requirements in deployment sections

Code Quality ✓

• All Python backend compiles without errors (python -m compileall backend)
• No syntax or import issues detected

The existing implementation already enforces strong security practices with fail-fast validation and clear user guidance.

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