- Add govdomains_sync.py: clones CISA dotgov-data, parses CSV, tracks first_seen dates
- Add /api/govdomains and /api/govdomains/stats Flask endpoints with range/type/search filters
- Add NEWS FEED | .GOV TRACKER toggle to RADAR page
- Domain type badges (Federal=red, State=blue, City=green, County=amber)
- New domain detection with pulsing green highlight and NEW badge
- Responsive grid layout with stats bar and result count
