Add enterprise growth APIs, billing, admin UI, and test suite.

Fix analytics accuracy, tenant isolation, and event-loop blocking.

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

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

Add publish-help contact form with support email routing.

Fix: datetime naive/aware crash across embed-token, access-repo, superadmin, expiry-task + friendly no-subscription UI

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

Phase 1.2+5.1+6.2+6.5: Book cover upload with resizing, conversion funnel analytics, intent distribution, backup system, CI/CD pipeline

Fix: replace all stale app.services.retriever imports with vector_store

Restructure project for HF Spaces deployment