Remove min_interval_seconds from plugin workers; vacuum default to 17m (#8790)

remove min_interval_seconds from plugin workers and default vacuum interval to 17m

The worker-level min_interval_seconds was redundant with the admin-side
DetectionIntervalSeconds, complicating scheduling logic. Remove it from
vacuum, volume_balance, erasure_coding, and ec_balance handlers.

Also change the vacuum default DetectionIntervalSeconds from 2 hours to
17 minutes to match the previous default behavior.

weed/admin/maintenance/maintenance_config_proto.go

@@ -51,9 +51,8 @@ func (mcm *MaintenanceConfigManager) GetVacuumConfig(taskType string) *worker_pb
 	}
 	// Return defaults if not configured
 	return &worker_pb.VacuumTaskConfig{
-		GarbageThreshold:   0.3,
-		MinVolumeAgeHours:  24,
-		MinIntervalSeconds: 7 * 24 * 60 * 60, // 7 days
+		GarbageThreshold:  0.3,
+		MinVolumeAgeHours: 24,
 	}
 }