Add Hytale config editor and Prometheus integration

- Add Node Exporter target for Hytale server (10.0.30.204:9100)
- Add Hytale config read/write functions to ssh.js
- Add GET/PUT /hytale/config API routes
- Create HytaleConfigEditor.jsx with JSON syntax highlighting
- Add Hytale config tab to ServerDetail.jsx
- Add stopCmd and port to Hytale server config

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

gsm-backend/config.json

@@ -102,7 +102,9 @@
       "sshUser": "beeck",
       "workDir": "/opt/hytale/Server",
       "startCmd": "./start-server.sh",
-      "logCmd": "ls -t /opt/hytale/Server/logs/*.log | head -1 | xargs tail -n"
+      "stopCmd": "/stop",
+      "logCmd": "ls -t /opt/hytale/Server/logs/*.log | head -1 | xargs tail -n",
+      "port": 5520
     }
   ]
 }