Production readiness update — robots.txt, /faq, /docs index, LP nav, metrics dashboard foundation
- Added /robots.txt via Next.js Metadata API with /api, /dashboard, /admin, /auth disallow.
- Published the launch-faq-stash 20 questions plus 5 compare-page questions as /faq.
- Shipped /docs index that surfaces every public customer setup guide grouped by source / destination.
- Added FAQ and Docs links to the LP top navigation.
- Built the internal metrics dashboard (/admin/metrics + /api/metrics/dashboard) for waitlist, sync success, and error rates.
