chore(addon/aikefu): API的响应结构现在与Dify API的标准格式保持一致，提高了代码的一致性和可维护性

src/app/api/controller/Kefu.php

@@ -496,57 +496,6 @@ class Kefu extends BaseApi
         }
     }
 
-    /**
-     * 创建新会话
-     * @return \think\response\Json
-     */
-    public function createConversation()
-    {
-        // 获取请求参数
-        $user_id = $this->params['user_id'] ?? $this->member_id;
-
-        // (可选）获取站点ID和会员ID，可以通过事件数据传递
-        $site_id = $this->params['uniacid'] ?? $this->site_id; // 使用 uniacid, 方便以后迁移，而且uniacid 是唯一的, site_id 不是，同时被params给过滤了
-        $member_id = $this->params['member_id'] ?? $this->member_id;
-        $token = $this->params['token'] ?? $this->token;  
-
-        try {
-            // 准备事件数据
-            $event_data = [
-                'user_id' => $user_id,
-                'site_id' =>$site_id,
-                'member_id' => $member_id,
-                'token' => $token,
-            ];
-
-            // 触发创建会话事件
-            $result = event('KefuCreateConversation', $event_data);
-            
-            // 处理事件结果
-            $response = [
-                'code' => 0,
-                'message' => 'success',
-                'data' => []
-            ];
-            
-            if (is_array($result) && !empty($result)) {
-                foreach ($result as $res) {
-                    if (isset($res['code']) && $res['code'] < 0) {
-                        $response = $res;
-                        break;
-                    }
-                    if (isset($res['data'])) {
-                        $response['data'] = array_merge($response['data'], $res['data']);
-                    }
-                }
-            }
-
-            return $this->response($response);
-        } catch (\Exception $e) {
-            return $this->response($this->error('请求失败：' . $e->getMessage()));
-        }
-    }
-
     /**
      * 获取会话历史
      * @return \think\response\Json