New firewall.DisableGlobal() removes the wireguard_ui_global nftables
table without touching stored IP list entries, and firewall.IsGlobalEnabled()
reports whether it's currently loaded. New GET /firewall-lists/status and
POST /firewall-lists/disable endpoints (admin-only), plus a status badge
and "Toggle enable/disable" button on the Global Firewall Lists page -
one click to turn the whole thing off without losing the list contents,
and back on again (re-applies the current ruleset).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
