feat(analytics): enhance Google Analytics with privacy compliance and comprehensive tracking

- Add automatic route change tracking for SPA navigation
- Implement Cookie consent banner for GDPR compliance
- Add performance tracking (LCP, FID, CLS Web Vitals)
- Add outbound link click tracking
- Integrate contact form submission tracking with conversion events
- Add CTA button click tracking in hero section
- Integrate error tracking in ErrorBoundary component
- Extend analytics utility library with 15+ tracking functions
- Configure IP anonymization and privacy settings
- Remove unused test files and deployment scripts
- Update case studies to include only specified cases
- Fix mobile navigation active state issues
- Fix lint errors in test files and components

BREAKING CHANGE: Google Analytics now requires user consent before tracking

src/components/layout/breadcrumb.tsx

@@ -15,7 +15,7 @@ interface BreadcrumbProps {
 export function Breadcrumb({ items }: BreadcrumbProps) {
   return (
     <nav aria-label="breadcrumb" className="flex items-center space-x-2 text-sm text-[#5C5C5C] py-4">
-      <StaticLink href="/" className="flex items-center hover:text-[#C41E3A] transition-colors">
+      <StaticLink href="/" className="flex items-center hover:text-[#C41E3A] transition-colors" aria-label="返回首页">
         <Home className="w-4 h-4" />
       </StaticLink>
       {items.map((item, index) => (