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

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

dwarfctl/deploy/dwarfctl.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=DWARF Mini telescope daemon (persistent WS + RTSP + visual odometry)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/dwarfctl serve --ip 192.168.88.1 --cam wide --addr 127.0.0.1:7777
+Restart=on-failure
+RestartSec=3
+# Logs go to journald (Captured by systemd).
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=default.target