fix: repair 8 broken unit tests after chatbot overhaul

Deliver enterprise features with JWT blacklist, SuperAdmin TOTP, and CI hardening.

Implement Enterprise Worth Roadmap (R-139–R-173).

feat: Phases 1-5 production improvements + 8 bug fixes

Production hardening: JWT blacklist, TOTP, Pydantic schemas, Prometheus, SSRF fix, CSP, Redis auth, Celery backup — 35 items across P0-P5

Fix token display for unsubscribed authors and add SuperAdmin author removal.

Unify token tracking, smart links, and personality settings across admin and chat.