Initial commit: Go driver for the Lian Li Galahad II LCD

Streams H.264 to the Galahad II LCD via USB (gousb) with:
- ffmpeg CLI transcoding (no fragile FFmpeg C-ABI bindings)
- pure-Go Annex-B access-unit splitting
- framerate pacing with graceful shutdown and USB reconnect
- TOML config, cobra CLI, structured slog logging, unit tests

packaging/galahad2lcd.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=galahad2lcd Service
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/galahad2lcd daemon
+Restart=on-failure
+RestartSec=5
+User=root
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target