#feature: update AI log analysis

app/Clients/AiClient.php

@@ -140,7 +140,7 @@ class AiClient
                 ]);
 
             if ($response->successful()) {
-                return $response->json('choices.0.message.content', '');
+                return $response->json('choices.0.message.content') ?? '';
             }
 
             // 处理 429 Too Many Requests 错误