Add Hytale server support with tmux runtime

- Add tmux runtime support to ssh.js (status, start, stop, logs, uptime)
- Add Hytale server configuration to config.json
- Add Hytale server info and logo to frontend (ServerCard, ServerDetail)
- Add Hytale emoji to Discord notification mapping
- Update documentation with Hytale server details

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

gsm-backend/config.json

@@ -90,6 +90,19 @@
       "sshUser": "openttd",
       "workDir": "/opt/openttd",
       "port": 3979
+    },
+    {
+      "id": "hytale",
+      "name": "Hytale",
+      "host": "10.0.30.204",
+      "type": "hytale",
+      "runtime": "tmux",
+      "external": true,
+      "tmuxName": "hytale",
+      "sshUser": "beeck",
+      "workDir": "/opt/hytale/Server",
+      "startCmd": "./start-server.sh",
+      "logCmd": "ls -t /opt/hytale/Server/logs/*.log | head -1 | xargs tail -n"
     }
   ]
 }