James Smith e1b532d48a Fix SSE first-byte delay in ADS-B and controller streams; harden WebSocket init ...

- 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>

2026-03-18 20:40:15 +00:00

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