data/*.json was excluded by .dockerignore, so wefax_stations.json was
never copied into the container image. The volume mounts in docker-compose
only cover subdirectories (weather_sat, adsb, etc.), leaving the stations
file inaccessible at runtime — causing the /wefax/stations route to 500
and the station/frequency dropdowns to appear empty.
Also adds a graceful file-existence check in load_stations() so a missing
file logs a warning and returns an empty list instead of an unhandled
FileNotFoundError.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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