Summary

Add set firewall group remote-group <name> interval <value> to control how
often each remote group's list is re-downloaded, independent of the global
firewall global-options resolver-interval. The value accepts plain seconds
or time-unit suffixes (s/m/h/d, e.g. 4h), range 60 seconds to 1 day. When
not set, the group keeps following the global resolver-interval, so existing
configurations are unaffected.

Use case

Remote groups (e.g. public blocklists) often only update a few times per day,
while the global resolver-interval also drives domain-group/FQDN resolution
and typically needs to stay short (default 300s). Today every remote group is
re-downloaded on every resolver tick, which wastes bandwidth and hammers list
providers; some providers rate-limit or ban aggressive fetchers. A per-group
interval lets users poll each list at the rate its provider recommends
(e.g. every 4 hours) without slowing DNS resolution for domain groups.