Covers 6 options for storing passwords securely:
1. .env file (current, good for personal use)
2. Environment variables (better for production)
3. Separate secrets file
4. Docker secrets
5. HashiCorp Vault (enterprise)
6. Git secrets (CI/CD only)
Recommendation: Current .env setup is fine for personal/research use
Improvement: chmod 600 .env (done)
Includes security checklist, rotation procedures, and testing
