为啥不把delta seconds和worker id换个位置？

CachedUidGenerator有可能使用未来到时间，（对于单个实例应用来说）当服务立刻重启后，worker id+1，但是开始时间有可能回到上次的最大时间之前，导致生产的Uid不是单调递增的

Start by reading CachedUidGenerator and its handling of delta seconds, worker ID, and restart state. Reproduce the immediate-restart scenario described in the issue and inspect whether generated UIDs can move backward. Done means the proposed layout change is evaluated and the generator preserves monotonic ordering for a single instance after restart.

Written by the indexing model from the issue text.