fix: 修复随机选择算法以确保概率均匀性(边界值问题修复) #78
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在选择随机元素时,修正了 Math.floor() 的使用(向下取整),确保随机索引的范围正确,避免了潜在的偏差问题。此修改适用于人员抽奖和其他随机选择场景。