derekc 3022bc328b Security hardening: go-live review fixes ...

- TV tokens upgraded from 4 to 6 digits; Regen Token button in Admin
- Nginx rate limiting on TV dashboard and WebSocket endpoints
- Login lockout after 5 failed attempts (15 min); clears on admin password reset
- HSTS header added; CSP unsafe-inline removed from script-src; CORS restricted to explicit methods/headers
- Dependency CVE fixes: PyJWT 2.12.0, aiomysql 0.3.0, cryptography 46.0.5, python-multipart 0.0.22
- datetime.utcnow() replaced with datetime.now(timezone.utc) throughout
- SQL identifier whitelist for startup migration queries
- README updated: security notes section, lockout docs, token regen, NPM proxy guidance

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-22 00:00:14 -07:00

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