feat(e2e): 添加完整的E2E测试框架和测试用例

添加Playwright测试框架配置和基础页面对象
实现冒烟测试用例覆盖首页和联系页面核心功能
更新导航组件以支持滚动高亮功能
添加BackButton组件统一返回按钮行为
配置Woodpecker CI集成和测试报告生成

e2e/src/fixtures/a11y.fixture.ts

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+import { test as base } from '@playwright/test';
+import { AxeBuilder } from '@axe-core/playwright';
+
+export const test = base.extend({
+  makeAxeBuilder: async ({ page }, use) => {
+    const makeAxeBuilder = () => new AxeBuilder({ page });
+    await use(makeAxeBuilder);
+  },
+});
+
+export { expect } from '@playwright/test';

e2e/src/fixtures/base.fixture.ts

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+import { test as base, Page } from '@playwright/test';
+import { HomePage } from '../pages/HomePage';
+import { ContactPage } from '../pages/ContactPage';
+import { TestDataGenerator } from '../utils/TestDataGenerator';
+
+export type TestFixtures = {
+  homePage: HomePage;
+  contactPage: ContactPage;
+  testDataGenerator: typeof TestDataGenerator;
+};
+
+export const test = base.extend<TestFixtures>({
+  homePage: async ({ page }, use) => {
+    const homePage = new HomePage(page);
+    await use(homePage);
+  },
+
+  contactPage: async ({ page }, use) => {
+    const contactPage = new ContactPage(page);
+    await use(contactPage);
+  },
+
+  testDataGenerator: async ({}, use) => {
+    await use(TestDataGenerator);
+  },
+});
+
+export const expect = test.expect;