fp-sensecraft
GET /render.png?lat=&lon=&radius=   PNG 1200x1600 for the 13.3" Spectra 6 panel
GET /render/:lat/:lon/:radius.png   same, path style
GET /view?lat=&lon=&radius=         full-bleed HTML for SenseCraft HMI "Web Content"
GET /api/sky?lat=&lon=&radius=      normalised JSON
Options: radius (NM) | radius_km, max=1..5, theme=red|blue|black|white|yellow|green, label=, dither=snap|fs|none,
         orientation=portrait|landscape, w=, h=, ground=1, tz=Europe/Paris, demo=1, format=svg
Data: FlightPortrait network feeders (ODbL 1.0)