fix: vitest 全局超时从 5s 提到 15s，防止 CI 高负载偶发超时

- vite.config.ts: 添加 testTimeout: 15_000
- useStep5Voice.test.tsx: 冒烟测试单独加 15s 超时兜底

apps/web/src/test/pages/generate/useStep5Voice.test.tsx

@@ -93,5 +93,5 @@ describe("useStep5Voice smoke test", () => {
     )
     expect(result.current).toBeDefined()
     expect(typeof result.current.handlePlayCloneSample).toBe("function")
-  })
+  }, 15_000)
 })

apps/web/vite.config.ts

@@ -13,6 +13,7 @@ export default defineConfig({
     environment: "jsdom",
     globals: true,
     setupFiles: ["./src/test/setup.ts"],
+    testTimeout: 15_000, // 全局 15 秒，防止 CI 高负载时偶发超时
   },
   plugins: [
     react({