feat: add client config script and systemd unit

scripts/rustdesk-client-local.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=RustDesk Client (local hbbs)
+After=xorg-dummy.service network.target
+
+[Service]
+Type=simple
+User=root
+Environment="DISPLAY=:0"
+Environment="XAUTHORITY=/root/.Xauthority"
+ExecStartPre=/root/write-rustdesk-config.sh
+ExecStartPre=/bin/sleep 2
+ExecStart=/usr/share/rustdesk/rustdesk --server
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target