Change 'SSH Fallback' to 'Proxy (SSH)' in Capabilities column

The "SSH Fallback" label was confusing to users. Changed to "Proxy (SSH)"
to make it clearer that the proxy is using SSH to collect temperature data
from cluster nodes.

This appears in the Capabilities column on Settings → Nodes when:
- Temperature monitoring is enabled
- Socket proxy is not available/healthy
- HTTPS proxy is not available/reachable

frontend-modern/src/components/Settings/ConfiguredNodeTables.tsx

@@ -105,7 +105,7 @@ const resolveTemperatureTransport = (
   }
 
   return {
-    label: 'SSH fallback',
+    label: 'Proxy (SSH)',
     badgeClass: 'bg-gray-100 dark:bg-gray-800 text-gray-600 dark:text-gray-300',
   };
 };