feat(物品系统): 新增灵魂物品类型及相关功能

- 在ItemStore.gd中添加SOUL物品类型及其映射
- 在EntityBase.gd中为物品栏添加SOUL类型及其上限
- 新增灵魂物品的SVG图标及导入配置
- 为角色(KukeMC, Bear, Chick)添加灵魂掉落配置
- 在武器卡片界面添加灵魂提炼和镶嵌按钮

scripts/Tools/ItemStore.gd

@@ -5,19 +5,22 @@ enum ItemType {
 	BASEBALL,
 	BASKETBALL,
 	APPLE,
-	BEACHBALL
+	BEACHBALL,
+	SOUL,
 }
 static var nameMap = {
 	ItemType.BASEBALL: "棒球",
 	ItemType.BASKETBALL: "篮球",
 	ItemType.APPLE: "苹果",
-	ItemType.BEACHBALL: "沙滩球"
+	ItemType.BEACHBALL: "沙滩球",
+	ItemType.SOUL: "灵魂",
 }
 static var idMap = {
 	ItemType.BASEBALL: "baseball",
 	ItemType.BASKETBALL: "basketball",
 	ItemType.APPLE: "apple",
-	ItemType.BEACHBALL: "beachball"
+	ItemType.BEACHBALL: "beachball",
+	ItemType.SOUL: "soul",
 }
 static func getTexture(type: ItemType) -> Texture2D:
 	return load("res://resources/items/%s.svg" % idMap[type])