fix: update machine management test to use role-based selector for menu item

- Change selector for the machine management menu item from text-based to role-based for improved reliability in E2E tests

tests/e2e/machine.spec.ts

@@ -206,8 +206,8 @@ test.describe('机器管理 CRUD 测试', () => {
   test('从侧边栏导航到机器管理', async ({ page }) => {
     await login(page)
 
-    // 点击侧边栏机器管理菜单
-    await page.getByText('机器管理').click()
+    // 点击侧边栏机器管理菜单项
+    await page.getByRole('menuitem', { name: '机器管理' }).click()
 
     // 验证跳转到机器管理页面
     await expect(page).toHaveURL(/\/machine/)