- 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
New page at /admin/scrape/cian-cookies:
- Textarea for pasting Cookie-Editor array or plain dict JSON
- Client-side format auto-detection and conversion
- Live preview: detected N cookies with key names
- Upload button → POST /api/v1/admin/scrape/cian/upload-cookies
- Test Session button → GET /api/v1/admin/scrape/cian/test-auth
- Error/success inline banners, collapsible instructions
- Admin token from localStorage (same pattern as /admin/scrape)
- Tab added to admin nav layout
Backend endpoints from PR #457 (Stage 4).