CNPC Sophisticated Backpacks

Added support for Sophisticated Backpacks to Custom NPC merchants, allowing them to deduct the price directly from your backpack for exchanges. Curios API is now fully supported, so it works perfectly even when the backpack is equipped in a curios slot. 增加了对cNPC商人的精妙背包的支持，允许他们直接从你的背包中扣除价格进行交换。现在完全支持Curios API，所以即使背包装备在Curios插槽中，它也能完美地工作。