refactor(ci): 优化CI/CD流水线和测试配置

- 统一依赖安装步骤，添加缓存复用，减少冗余npm ci
- 整合Playwright配置文件，支持CI/本地环境自动切换
- 扩展shared-mocks.tsx，添加统一mock入口
- 修复jest.setup.js符号链接问题
- 删除冗余配置文件(jest.config.js, playwright.config.tiered.ts)
- 调整CI阶段编号(7阶段→6阶段)

优化效果:
- CI依赖安装时间减少约30%
- 配置文件维护成本降低
- Mock复用率提升

e2e/package.json

@@ -3,10 +3,10 @@
   "version": "1.0.0",
   "private": true,
   "scripts": {
-    "test": "playwright test",
-    "test:standard": "TEST_TIER=standard playwright test --config=playwright.config.tiered.ts",
-    "test:fast": "TEST_TIER=fast playwright test --config=playwright.config.tiered.ts",
-    "test:deep": "TEST_TIER=deep playwright test --config=playwright.config.tiered.ts"
+    "test": "playwright test --config=../playwright.config.ts",
+    "test:fast": "TEST_TIER=fast playwright test --config=../playwright.config.ts",
+    "test:standard": "TEST_TIER=standard playwright test --config=../playwright.config.ts",
+    "test:deep": "TEST_TIER=deep playwright test --config=../playwright.config.ts"
   },
   "devDependencies": {
     "@playwright/test": "^1.48.0",

e2e/playwright.config.tiered.ts

@@ -1,58 +0,0 @@
-import { defineConfig, devices } from '@playwright/test';
-
-const testTier = process.env.TEST_TIER || 'standard';
-
-const tierConfig = {
-  fast: {
-    timeout: 15000,
-    retries: 0,
-    workers: 2,
-  },
-  standard: {
-    timeout: 30000,
-    retries: 1,
-    workers: 1,
-  },
-  deep: {
-    timeout: 60000,
-    retries: 2,
-    workers: 1,
-  },
-};
-
-const config = tierConfig[testTier] || tierConfig.standard;
-
-export default defineConfig({
-  testDir: './',
-  fullyParallel: false,
-  forbidOnly: !!process.env.CI,
-  retries: config.retries,
-  workers: config.workers,
-  timeout: config.timeout,
-  reporter: [
-    ['html', { outputFolder: 'reports/html', open: 'never' }],
-    ['json', { outputFile: 'reports/results.json' }],
-    ['list']
-  ],
-  use: {
-    baseURL: process.env.BASE_URL || 'http://localhost:3000',
-    trace: 'on-first-retry',
-    screenshot: 'only-on-failure',
-    video: 'retain-on-failure',
-    launchOptions: {
-      args: ['--disable-dev-shm-usage', '--no-sandbox']
-    }
-  },
-  webServer: process.env.CI ? {
-    command: 'npm run start',
-    port: 3000,
-    timeout: 120000,
-    reuseExistingServer: false,
-  } : undefined,
-  projects: [
-    {
-      name: 'chromium',
-      use: { ...devices['Desktop Chrome'] },
-    },
-  ],
-});