- Move page from main frontend to tradein-mvp/frontend/src/app/scrapers/cian-cookies/
so /trade-in/api/* Caddy route maps to tradein backend (where
/admin/scrape/cian/upload-cookies endpoint lives)
- Remove X-Admin-Token header (tradein admin endpoints don't require it;
auth = Caddy basic_auth) and remove localStorage token state
- Clear textarea on successful upload (security hygiene per review)
- Add Cian Cookies tab to tradein-mvp Topbar nav
- Revert tab entry in main frontend admin layout
