Fix doorbell-viewport bringup issues

- Fix websockets headers kwarg via inspect (works across all versions)
- Use full path /usr/bin/vcgencmd; add libraspberrypi-bin dependency
- Fix UniFi Protect WS packet decoder to handle multiple concatenated
  packets per message (action+data in single frame)
- Fetch lastUpdateId from bootstrap for WS URL
- Switch fbcon disable from video=HDMI-A-1:D to fbcon=map:99 (fkms compat)
- Default drm_connector to DSI-1 for fkms; drop hardcoded drm_mode
- Add --no-audio and --hwdec=no to mpv; fix DRM mode-setting race on startup
- Add PoE HAT fan control with configurable temp thresholds

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