feat(物品系统): 新增饮料物品并优化物品显示逻辑

添加草莓气泡水物品资源及配置
调整阴阳球物品属性数值
优化物品显示逻辑，支持负数消耗显示为绿色
修改物品应用逻辑，允许负消耗直接扣除

scripts/Statemachine/ItemShow.gd

@@ -24,7 +24,11 @@ func _physics_process(_delta):
 	avatarTexture.texture = ItemStore.getTexture(type)
 	countLabel.text = str(count)
 	if enough:
-		countLabel.label_settings.font_color = Color.WHITE
+		if count < 0:
+			countLabel.label_settings.font_color = Color.GREEN
+			countLabel.text = "+%d" % abs(count)
+		else:
+			countLabel.label_settings.font_color = Color.WHITE
 	else:
 		countLabel.label_settings.font_color = Color.RED