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

resources/items/baseball.svg

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resources/items/basketball.svg

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resources/items/beachball.svg.import

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