• 智能路由按额度重置时间排序：多个订阅账号中，额度还有富余的里，优先用最快重置的那个——它剩下的额度一到重置就作废，而晚重置的账号留着以后用。
• 重置时间取账号所有额度窗口里最晚的那个（比如周额度，而不是其中的 5 小时窗口）；不知道重置时间的账号排在后面；相差几分钟算同一小时，不会来回切换，prompt cache 保持热。
• 快用完的账号（≥90%）仍然留到最后，失败后的休息规则不变。

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• Smart routing goes by when each account's allowance resets: of the subscriptions with quota to spare, the one that resets soonest goes first — what it has left is lost at the reset, while one resetting later keeps.
• An account's reset is the latest of its windows (the week, not the five hours within it); one whose reset isn't known comes after; a few minutes apart counts as the same hour, so the order doesn't flip and the prompt cache stays warm.
• An account running low (≥90%) is still kept for last, and the rests after a failure are unchanged.