应用: 拼多多
任务: 打开拼多多，搜索‘手机壳’，点击第一条商品，点击加入购物车按钮
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: TYPE
type_text: 手机壳
step_id: 3
action: CLICK
step_id: 4
action: CLICK
step_id: 5
action: CLICK