Added weapon selection probability optimization: When you possess weapons of a certain type, the probability of weapons of that type appearing in the shop increases. Furthermore, for each additional copy of the same weapon you own, the chance of that exact weapon appearing in the shop increases by an extra 5%.

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新增武器筛选概率优化：持有某类型的武器时，商店中该类型的武器出现概率提升。持有同一武器的数量越多，每增加一把该武器，其在商店的刷新概率额外提高5%。

Sorry, I’ve added the add_item function that I previously forgot to include.

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抱歉，添加了之前忘记添加的add_item函数

This is my first time making mod, thanks for using.