Add camera streaming guide with all access methods

Comprehensive documentation for accessing the DWARF camera streams:
- RTSP URLs and channels (ch0=tele, ch1=wide)
- The critical prerequisite: camera must be opened via WebSocket first
- ffmpeg commands for frame capture, timelapse, and video recording
- mpv and VLC usage with TCP transport
- Python/OpenCV integration example
- Troubleshooting common issues (black image, connection refused, VLC delay)
- Comparison of RTSP vs MJPEG modes across device models

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Assisted-by: Crush:glm-5.2

analysis/DEVICE_MODELS.md

@@ -119,3 +119,7 @@ supports the older sun/moon tracking flow without extra confirmation.
 3. Gate features client-side: warn when attempting panorama on a Mini,
    hide auto-shutdown, etc.
 4. Log the reported FoV in `health` output to help identify the model.
+5. **Visual odometry calibration:** the Mini's wide-cam FoV is uncertain
+   (8.0°×6.5° display vs 42.65°×24.45° live-reported — see above). When using
+   `dwarfctl orient`, the pixel shift is always correct; to get accurate degree
+   values, calibrate `--fov-h`/`--fov-v` by slewing a known motor angle.