chore(addon/aikefu): 调整config的配置内容

src/addon/aikefu/model/Config.php

@@ -20,6 +20,15 @@ class Config extends BaseModel
     public function setConfig($data, $site_id = 0, $app_module = 'shop')
     {
         $config = new ConfigModel();
+        
+        // 获取原始配置
+        $original_config = $this->getConfig($site_id, $app_module)['data']['value'] ?? [];
+        
+        // 如果 API Key 为空或保持不变，则使用原始值
+        if (isset($data['api_key']) && empty($data['api_key'])) {
+            $data['api_key'] = $original_config['api_key'] ?? '';
+        }
+        
         $res = $config->setConfig($data, '智能客服配置', 1, [['site_id', '=', $site_id], ['app_module', '=', $app_module], ['config_key', '=', 'AIKEFU_CONFIG']]);
         return $res;
     }