common/signal/timer.go: Refator to use sync.Once #5052
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This was referenced Aug 31, 2025
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fix #5051
移除了烦人难懂的空指针检查 改为显式的once操作 finish() 无论如何只执行一次
settimeout在once被消耗后不再执行操作
mutex匿名结构体被重新修改为未导出字段 mutex相关功能不应该允许外部调用
so