Minutes is the natural granularity for detection cadence — every
production handler already set the seconds field to a 60-multiple
(17*60, 30*60, 3600, 24*60*60). Switching to minutes drops the *60
arithmetic and matches the unit conventions used elsewhere in the
plugin worker forms.
- Proto: AdminRuntimeDefaults + AdminRuntimeConfig.detection_interval_*
field renamed.
- Helpers: durationFromMinutes / minutesFromDuration alongside the
existing seconds variants in plugin_scheduler.go.
- Handlers: vacuum, ec_balance, balance, erasure_coding, iceberg,
admin_script, s3_lifecycle now declare DetectionIntervalMinutes.
- Admin: scheduler_status + types + UI templ + plugin_api.go pass
through the new field; UI label and table cells switch to "min".
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