refactor: 完成静态网站转换，移除所有 CMS 和动态功能

- 删除数据库相关代码 (src/db/)
- 删除 API 路由 (src/app/api/)
- 删除认证相关代码 (src/lib/auth/, src/providers/)
- 删除监控和安全中间件 (src/lib/security/, src/lib/monitoring/)
- 删除 hooks (use-news, use-products, use-services)
- 更新组件为静态数据源
- 添加 nginx 静态配置和部署脚本
- 添加 static-link 组件

src/components/layout/breadcrumb.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import Link from 'next/link';
+import { StaticLink } from '@/components/ui/static-link';
 import { ChevronRight, Home } from 'lucide-react';
 
 interface BreadcrumbItem {
@@ -15,18 +15,18 @@ 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">
-      <Link href="/" className="flex items-center hover:text-[#C41E3A] transition-colors">
+      <StaticLink href="/" className="flex items-center hover:text-[#C41E3A] transition-colors">
         <Home className="w-4 h-4" />
-      </Link>
+      </StaticLink>
       {items.map((item, index) => (
         <div key={index} className="flex items-center">
           <ChevronRight className="w-4 h-4 text-[#E5E5E5]" />
-          <Link
+          <StaticLink
             href={item.href}
             className="ml-2 hover:text-[#C41E3A] transition-colors"
           >
             {item.label}
-          </Link>
+          </StaticLink>
         </div>
       ))}
     </nav>