feat: add persistent RustDesk client service for VPS

- Add rustdesk-vps.service (systemd unit with Xvfb + DBus)
- Add rustdesk-vps-start.sh (Xvfb startup + DBus session for RustDesk)
- Update xorg-dummy.service without -nolisten local (fixes socket access)
- Update rustdesk-dummy.service with /usr/share/ binary path
- Add docker-compose.vps.yml with hbbs/hbbr RustDesk server
- RustDesk client connects to public relay rs-ny.rustdesk.com:21116
- ID: 458564614 (confirmed via --get-id)
- Password: retrowest

config/vps/rustdesk-vps.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=RustDesk VPS Client
+After=network.target
+
+[Service]
+Type=simple
+User=root
+Environment="DISPLAY=:99"
+ExecStartPre=-/usr/bin/pkill -9 Xvfb
+ExecStart=/usr/local/bin/rustdesk-vps-start.sh
+Restart=always
+RestartSec=5
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target