修改默认模型

@@ -19,7 +19,7 @@ class AiCommandService
      * gemini-2.5-flash-preview-05-20
      * gemini-2.5-flash-preview-05-20
      * gemini-2.5-flash-preview-04-17
      * gemini-2.5-flash-preview-04-17
      */
      */
-    public $model = 'gemini-2.5-pro-preview-05-06';
+    public $model = 'gemini-2.0-flash-lite';
 
 
     public $supplier = 'google';
     public $supplier = 'google';