New servers previously got a bare ConfigFilePath default with no way to set/edit EndpointAddress, FirewallMark, or Table afterward. Adds GET/POST /servers/:id/settings (view/save ServerSetting, admin-only for writes) and a "Settings" button + modal on each server card in servers.html. CreateServer now seeds FirewallMark/Table with the same defaults the legacy single-server bootstrap uses, instead of leaving them blank.