feat: open a port in ufw by hand from the panel settings

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/server/server.go

@@ -217,6 +217,7 @@ func (s *Server) Handler() http.Handler {
 	mux.Handle("POST /settings/admins/add", s.requireAdmin(s.handleAddAdmin))
 	mux.Handle("POST /settings/admins/delete", s.requireAdmin(s.handleDeleteAdmin))
 	mux.Handle("POST /settings/ufw/toggle", s.requireAdmin(s.handleUfwToggle))
+	mux.Handle("POST /settings/ufw/add", s.requireAdmin(s.handleUfwAdd))
 	mux.Handle("POST /settings/ufw/revoke", s.requireAdmin(s.handleUfwRevoke))
 
 	// Panel terminal over HTTP long-polling (admin-only).