feat: first deploy via update_ssh_monitor.sh --deploy

Add first_deploy.sh wrapper and --deploy mode: git clone, install
ssh-monitor and sac-client, optional config/systemd/updater copy,
console summary and config variable checklist.

ssh-monitor.service.example

@@ -0,0 +1,14 @@
+[Unit]
+Description=SSH Monitor with Telegram alerts and SAC integration
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/ssh-monitor
+Restart=always
+RestartSec=5
+User=root
+
+[Install]
+WantedBy=multi-user.target