Ship chatbot intelligence upgrades and author-friendly Readers tab

Fix enterprise admin 500s: ensure tables exist and soften agency/email UX.

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

Add SuperAdmin retailer API keys with priority over env and free scraping.

Fetch list prices during platform presence scans where retailers allow it.

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