added netbird-watcher script

watcher/netbird-watcher.service

@@ -0,0 +1,19 @@
+[Unit]
+Description=NetBird Peer Renamer Watcher
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/opt/netbird-watcher/netbird_watcher.py --config /etc/netbird-watcher/config.json
+Restart=always
+RestartSec=10
+
+# Security hardening
+NoNewPrivileges=true
+ProtectSystem=strict
+ProtectHome=true
+ReadWritePaths=/var/lib/netbird-watcher
+PrivateTmp=true
+
+[Install]
+WantedBy=multi-user.target