fix(warehouse): 修复获取参数方法的调用

- 将 $this->request->params() 方法替换为 $this->request->param() 方法
- 修正了 mer_id 参数的获取方式以确保正确传递

app/controller/api/warehouse/Home.php

@@ -32,7 +32,7 @@ class Home extends BaseController
     public function classify(){
 
         // $merid=$this->merId;
-        $merid = $this->request->params(['mer_id']);
+        $merid = $this->request->param('mer_id');
         $cate_arr=[];
         $list = Db::name('store_category')
             -> where('is_show',1)