feat: add RustDesk Server scripts (hbbs+hbbr native, systemd, UFW)

- install-rustdesk-server.sh: download & install hbbs/hbbr from GitHub releases
- rustdesk-hbbs.service: systemd unit for ID-server (ports 21115-21116)
- rustdesk-hbbr.service: systemd unit for relay (port 21117)
- open-rustdesk-ports.sh: idempotent UFW port opening
- README.md: deployment instructions

Generated by orchestrator in APAW worktree, applied to VPS 2.59.219.61

scripts/rustdesk-hbbr.service

@@ -0,0 +1,23 @@
+[Unit]
+Description=RustDesk Server (hbbr — relay)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/hbbr
+WorkingDirectory=/var/lib/rustdesk-server
+Restart=on-failure
+RestartSec=5s
+
+NoNewPrivileges=true
+ProtectSystem=strict
+ProtectHome=true
+ReadWritePaths=/var/lib/rustdesk-server
+
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=rustdesk-hbbr
+
+[Install]
+WantedBy=multi-user.target