fix: check for success message text after form submission

test-framework/dev-audit/forms/forms.spec.ts

@@ -39,8 +39,8 @@ test.describe('表单验证测试', () => {
     await contactPage.submitForm();
     await page.waitForTimeout(3000);
 
-    const formExists = await page.locator('form').count();
-    expect(formExists).toBeGreaterThan(0);
+    const successMessage = await page.locator('text=消息已发送').count();
+    expect(successMessage).toBeGreaterThan(0);
   });
 
   test('联系表单 - 必填字段验证', async ({ page }) => {