Add fixed Contact Us tab and support email flow in admin panel.

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

Replace HTML platform scraping with API-first catalog hub.

Refactor admin API into service and repository layers.

Add publish-help contact form with support email routing.

Fix: JSONResponse args reversed causing all exception handlers to crash with TypeError

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