GPS interference zones

Lists GPS interference zones inferred from ADS-B navigation-accuracy degradation and aggregated into H3 cells. Coverage spans 22 theaters on a tiered cadence within the shared Wingbits quota: | Tier | Cadence | Theaters | | --------- | --------- | ------------------------------------------------------------------------------------------------- | | Hot | Hourly | iran, blacksea, israelgaza, redsea, taiwan, scs | | Watch | Every 3h | emed, korea, caucasus, kaliningrad-tight, finland-russia, us-south, bashi-luzon, east-china-sea | | Perimeter | Every 6h | us-pacom-west, us-northeast, aleutian-bering, baltic-south, giuk-greenland | | Daily | Every 24h | baltic-north, us-north, arctic-greenland-pass | Records expire 30 minutes after fetch. Align polling with the theater's tier. Supports x402 pay-per-request. Requests with a valid Bearer token use API-key authentication. Without a Bearer API key, start the x402 flow from the `402 Payment Required` response and `PAYMENT-REQUIRED` header; retry with `PAYMENT-SIGNATURE`.