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

@@ -0,0 +1,11 @@
+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';