test(cron): raise timeout for next/server cold-import on act runner

The test takes >5s on the QNAP act runner because dynamic import of
next/server has to transpile the module cold on first call. Raise the
per-test timeout to 15s to give it headroom without changing the test logic.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/src/app/api/cron/auth-anomaly-check/route.test.ts

@@ -82,7 +82,7 @@ describe("GET /api/cron/auth-anomaly-check — cron secret enforcement", () => {
     const { GET } = await importRoute();
     const res = await GET(makeRequest());
     expect(res.status).toBe(401);
-  });
+  }, 15_000); // next/server cold-import can take >5s on the act runner
 
   it("proceeds when verifyCronSecret returns null (allowed)", async () => {
     verifyCronSecretMock.mockReturnValue(null);