feat: 创建测试固件和数据管理

新增文件：
- e2e/fixtures/test-data.ts - 测试数据固件
- e2e/fixtures/auth.ts - 认证固件
- e2e/fixtures/storage-state.ts - 存储状态固件
- e2e/fixtures/index.ts - 导出索引文件

功能特性：
- 提供标准化的测试数据（新闻、产品、服务、案例）
- 支持环境变量配置管理员账号
- 封装认证流程，简化测试编写
- 支持存储状态复用，提升测试效率
- 提供XSS等安全测试数据

技术说明：
- 添加 ESLint 禁用注释，因为 Playwright fixture 的 use 函数不是 React Hook

e2e/fixtures/auth.ts

@@ -0,0 +1,26 @@
+/* eslint-disable react-hooks/rules-of-hooks */
+import { test as base } from '@playwright/test';
+import { AdminLoginPage } from '../pages/AdminLoginPage';
+import { testFixtures } from './test-data';
+
+type AuthFixtures = {
+  authenticatedPage: void;
+  adminLoginPage: AdminLoginPage;
+};
+
+export const test = base.extend<AuthFixtures>({
+  authenticatedPage: async ({ page }, use) => {
+    const loginPage = new AdminLoginPage(page);
+    await loginPage.goto();
+    await loginPage.login(testFixtures.adminUser.email, testFixtures.adminUser.password);
+    await loginPage.expectLoginSuccess();
+    
+    await use();
+  },
+  
+  adminLoginPage: async ({ page }, use) => {
+    await use(new AdminLoginPage(page));
+  },
+});
+
+export { expect } from '@playwright/test';

e2e/fixtures/index.ts

@@ -0,0 +1,3 @@
+export { testFixtures } from './test-data';
+export { test as authTest, expect } from './auth';
+export { test as storageStateTest } from './storage-state';

e2e/fixtures/storage-state.ts

@@ -0,0 +1,29 @@
+/* eslint-disable react-hooks/rules-of-hooks */
+import { test as base } from '@playwright/test';
+import path from 'path';
+
+const AUTH_FILE = path.join(__dirname, '../.auth/admin.json');
+
+type StorageStateFixtures = {
+  adminStorageState: string;
+};
+
+export const test = base.extend<StorageStateFixtures>({
+  adminStorageState: async ({ browser }, use) => {
+    const context = await browser.newContext();
+    const page = await context.newPage();
+    
+    await page.goto('/admin/login');
+    await page.fill('#email', process.env.ADMIN_EMAIL || 'admin@novalon.cn');
+    await page.fill('#password', process.env.ADMIN_PASSWORD || 'admin123456');
+    await page.click('button[type="submit"]');
+    await page.waitForURL(/\/admin(?!\/login)/);
+    
+    await page.context().storageState({ path: AUTH_FILE });
+    await context.close();
+    
+    await use(AUTH_FILE);
+  },
+});
+
+export { expect } from '@playwright/test';

e2e/fixtures/test-data.ts

@@ -0,0 +1,68 @@
+export const testFixtures = {
+  adminUser: {
+    email: process.env.ADMIN_EMAIL || 'admin@novalon.cn',
+    password: process.env.ADMIN_PASSWORD || 'admin123456',
+  },
+  
+  testContent: {
+    news: {
+      type: 'news' as const,
+      title: `测试新闻-${Date.now()}`,
+      slug: `test-news-${Date.now()}`,
+      excerpt: '这是一条测试新闻的摘要内容',
+      content: '<p>这是测试新闻的正文内容</p>',
+      category: '公司新闻',
+      tags: ['测试', '自动化'],
+      status: 'published' as const,
+    },
+    product: {
+      type: 'product' as const,
+      title: `测试产品-${Date.now()}`,
+      slug: `test-product-${Date.now()}`,
+      excerpt: '这是一个测试产品的描述',
+      content: '<p>测试产品的详细介绍</p>',
+      category: '软件产品',
+      tags: ['产品', '测试'],
+      status: 'published' as const,
+    },
+    service: {
+      type: 'service' as const,
+      title: `测试服务-${Date.now()}`,
+      slug: `test-service-${Date.now()}`,
+      excerpt: '这是一个测试服务的描述',
+      content: '<p>测试服务的详细介绍</p>',
+      category: '软件开发',
+      tags: ['服务', '测试'],
+      status: 'published' as const,
+    },
+    case: {
+      type: 'case' as const,
+      title: `测试案例-${Date.now()}`,
+      slug: `test-case-${Date.now()}`,
+      excerpt: '这是一个测试案例的描述',
+      content: '<p>测试案例的详细介绍</p>',
+      category: '企业服务',
+      tags: ['案例', '测试'],
+      status: 'published' as const,
+    },
+  },
+  
+  invalidContent: {
+    empty: {
+      type: 'news' as const,
+      title: '',
+      slug: '',
+      content: '',
+    },
+    xss: {
+      type: 'news' as const,
+      title: `XSS测试-${Date.now()}`,
+      slug: `xss-test-${Date.now()}`,
+      excerpt: '<script>alert("XSS")</script>测试摘要',
+      content: '<p><script>alert("XSS")</script>测试内容</p>',
+      category: '安全测试',
+      tags: ['安全'],
+      status: 'published' as const,
+    },
+  },
+};