Wire the free data streams from docs/free-data-streams.md into the
dashboard as layer-panel toggles. Third-party APIs are proxied/cached
in FastAPI; raster tiles (IEM, RainViewer, GIBS) stay in the browser.
- Aircraft via ADSB.lol viewport poll (bbox required, radius ≤ 150 nm)
- Amtraker trains, NHC storms, WFIGS incidents/perimeters
- NWS + IEM SBW as /api/weather-alerts (does not collide with /api/alerts)
- AISStream worker is server-side only and idles without AISSTREAM_API_KEY
- Caltrans CWWP2 D1–D12 camera parser; FIRMS dual-write NOAA-20/21
