test(mobile): add mobile E2E test suite (53 tests) and fix layout issues

Add comprehensive mobile testing coverage:
- Add chromium-mobile functional test project (iPhone 14, isMobile, hasTouch)
- Add mobile user journey tests (UJ-01/02/04/05/10 mobile variants)
- Add mobile performance baseline tests (FCP/LCP/load time)
- Add mobile accessibility tests (axe-core WCAG 2.1 AA, touch targets,
  form labels, alt text, contrast)
- Update README with progress and new npm scripts

Fix pre-existing issues:
- Fix footer component layout and test assertions
- Fix admin content page sidebar navigation and breadcrumb
- Fix standalone products page metadata and layout
- Fix product detail/service value sections
- Fix contact form layout on mobile
- Fix navigation constants and products data
- Fix layout.tsx CMS config and theme handling
- Fix erp-upgrade content layout

prisma/seeds/standalone-products.ts

@@ -7,6 +7,7 @@ export const STANDALONE_PRODUCTS: StandaloneProduct[] = [
     title: '睿视 NovaVis',
     description: '面向执法机关的新一代智能数据分析平台，完全离线运行，AI驱动分析，百万级数据秒级响应。',
     image: '/images/products/novavis.jpg',
+    externalUrl: 'https://novavis.p.novalon.cn',
     category: '专业工具系列',
     categoryId: 'specialized',
     tags: ['资金追踪', '关系图谱', 'AI分析', '离线运行', '执法情报'],