Preserve supported expression fields instead of stringifying them, and probe individual fields only when whole-expression validation fails. Convert unsupported syntax and weekday ranges ending in 7 while preserving legacy date/weekday rules and valid OR branches.
Add execution regressions for issue #3099 and 64 calendar boundary cases in UTC and Asia/Shanghai. Ensure timezone child tests actually run under the Node test runner.
Validation: 745 tests passed, 8 skipped; final targeted regressions passed; backend compilation passed. Differential calendar checks matched 142,360 execution timestamps.
Fixes#3099
* refactor: migrate cron scheduling to node-cron
* feat: support annually midnight and minutely cron macros
* fix: harden cron recovery and system scheduler compatibility
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