* feat(aviation): add Wingbits as civilian flight fallback when OpenSky is unreachable
OpenSky is completely unreachable from Railway (direct fetch blocked,
residential proxy returning CONNECT 422). Wingbits is healthy with
2000+ flights per cycle.
Adds /wingbits/track relay endpoint that accepts a viewport bbox,
queries Wingbits /v1/flights, and returns all flights (no military
filter) as PositionSample objects. Wires it as third source in
trackAircraft after OpenSky relay and direct OpenSky attempts fail.
OpenSky remains first in the waterfall so it auto-recovers when the
proxy is fixed.
* fix(aviation): scale Wingbits bbox width by cos(lat) and read all onGround variants
P1: longitude degree is only 60 nm at the equator; multiply by cos(centerLat)
to avoid over-expanding the bbox at high latitudes.
P2: honour f.og ?? f.gr ?? f.onGround to match all Wingbits field variants
(mirrors seed-military-flights.mjs:871).
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