feat(物品系统): 新增沙滩球物品及相关功能

refactor(武器卡片): 调整武器类型和颜色映射
style(UI): 更新武器名称标签样式
fix(实体基础): 修正物品掉落逻辑
perf(音频): 优化音频处理模式
docs(物品存储): 更新物品枚举和映射
build(资源): 添加沙滩球SVG资源文件
chore(资源): 更新篮球和棒球SVG资源

scripts/Tools/ItemStore.gd

@@ -4,17 +4,20 @@ class_name ItemStore
 enum ItemType {
 	BASEBALL,
 	BASKETBALL,
-	APPLE
+	APPLE,
+	BEACHBALL
 }
 static var nameMap = {
 	ItemType.BASEBALL: "棒球",
 	ItemType.BASKETBALL: "篮球",
-	ItemType.APPLE: "苹果"
+	ItemType.APPLE: "苹果",
+	ItemType.BEACHBALL: "沙滩球"
 }
 static var idMap = {
 	ItemType.BASEBALL: "baseball",
 	ItemType.BASKETBALL: "basketball",
-	ItemType.APPLE: "apple"
+	ItemType.APPLE: "apple",
+	ItemType.BEACHBALL: "beachball"
 }
 static func getTexture(type: ItemType) -> Texture2D:
 	return load("res://resources/items/%s.svg" % idMap[type])