- Add immediate keepalive to /adsb/stream generator so the Werkzeug dev
server flushes response headers immediately on tracking start, preventing
the 30-second delay before the aircraft map begins receiving data
- Same fix for /controller/stream/all used by the ADSB dashboard in agent mode
- Widen WebSocket init exception guards in app.py from ImportError to
Exception so any startup failure (e.g. RuntimeError from flask-sock on
an unsupported WSGI server) is caught instead of propagating
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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