The websockets library defaults to ping_interval=20, ping_timeout=20.
go2rtc doesn't respond to these pings, so the upstream WebSocket was
being killed after ~50 seconds causing all camera streams to freeze.
Disabled ping_interval and ping_timeout on the upstream connection.
- Switch from WebRTC-first to MSE-first streaming (more reliable
across all camera types including high-res IP cameras)
- Send required {"type":"mse"} init message to go2rtc WebSocket
- Fix infinite re-render loop in configStore (pre-compute enabled
cameras instead of deriving in selector)
- Fix mqtt_bridge global variable scope in broadcast()
- Add React ErrorBoundary for visible crash reporting
- Remove unused go2rtcUrl dependency from useStream hook
