Fix API response handling for list vs dict

opnsense_device_manager.py

@@ -54,7 +54,10 @@ class OPNsenseDeviceManager:
         devices = []
         seen_macs = set()
         
-        for entry in result.get('data', []):
+        # Handle both list and dict responses
+        entries = result if isinstance(result, list) else result.get('data', [])
+        
+        for entry in entries:
             mac = entry.get('mac', '')
             ip = entry.get('ip', '')
             manufacturer = entry.get('manufacturer', 'Unknown')