The panel scheduler runs WithSeconds(), whose parser rejects a standard
five-field crontab such as "30 8 * * *". An admin who typed one into the
Telegram/Discord notify time or the LDAP sync schedule saved it without
error, AddJob then failed at startup, and the job silently never ran.
Admin-typed schedules now go through internal/util/cronspec, which takes
an optional seconds column plus the @descriptors and hands the scheduler
a parsed cron.Schedule. CheckValid rejects an unparseable schedule on
save, and a stored legacy value falls back to the job's default instead
of dropping the job.