fix(gateway): fail closed on unresolved discovery endpoints

src/cli/gateway-cli.coverage.test.ts

@@ -81,7 +81,8 @@ vi.mock("../daemon/program-args.js", () => ({
   }),
 }));
 
-vi.mock("../infra/bonjour-discovery.js", () => ({
+vi.mock("../infra/bonjour-discovery.js", async (importOriginal) => ({
+  ...(await importOriginal<typeof import("../infra/bonjour-discovery.js")>()),
   discoverGatewayBeacons: (opts: unknown) => discoverGatewayBeacons(opts),
 }));
 
@@ -147,6 +148,7 @@ describe("gateway-cli coverage", () => {
         displayName: "Studio",
         domain: "openclaw.internal.",
         host: "studio.openclaw.internal",
+        port: 18789,
         lanHost: "studio.local",
         tailnetDns: "studio.tailnet.ts.net",
         gatewayPort: 18789,