Cron 表达式解释器

上线前解释 cron 调度。

粘贴 Unix cron 表达式，得到可读摘要和逐字段拆解，方便评审和 runbook。

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Cron 解释

Expression: 0 9 * * MON-FRI
Meaning: At 09:00, Monday through Friday

Fields:
minute = 0
hour = 9
day of month = *
month = *
day of week = MON-FRI

Note: interpreted as a standard 5-field Unix cron expression. Timezone depends on the scheduler that runs it.

Fields: 5
Type: Unix cron