Fix temperature duplication in MQTT payload

Temperature now only appears at root level, not in details.

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

lan_checker.py

@@ -177,10 +177,11 @@ class LanChecker:
         }
 
         if result.details:
-            payload["details"] = result.details
             # Extract temperature for SNMP checks
             if "temperature" in result.details:
-                payload["temperature"] = result.details["temperature"]
+                payload["temperature"] = result.details.pop("temperature")
+            if result.details:
+                payload["details"] = result.details
 
         topic = f"lan_checker/{check['id']}/state"
         self.mqtt_client.publish(topic, json.dumps(payload), retain=True)