Yo's Trade Post

完成基础功能构建：游戏日刷新时执行交易；单次交易支持货币三级转换（物品-货币1-货币2-货币3）；物品自动堆叠。

Finished the basic function construction: execute transactions when the game day is refreshed; A single transaction supports three-level currency conversion (item - currency 1 - currency 2 - currency 3); Items are automatically stacked.