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/app/error.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useEffect } from 'react';
-import Link from 'next/link';
+import { StaticLink } from '@/components/ui/static-link';
 import { Button } from '@/components/ui/button';
 import { Home, RefreshCw, AlertTriangle } from 'lucide-react';
 
@@ -24,7 +24,7 @@ export default function Error({
             <div className="w-24 h-24 bg-[#C41E3A]/10 rounded-full flex items-center justify-center mx-auto mb-6">
               <AlertTriangle className="w-12 h-12 text-[#C41E3A]" />
             </div>
-            <div className="w-32 h-1 bg-[#C41E3A] mx-auto"></div>
+            <div className="w-32 h-1 bg-[#C41E3A] mx-auto" />
           </div>
 
           <h1 className="text-3xl font-bold text-[#1C1C1C] mb-4">
@@ -64,10 +64,10 @@ export default function Error({
               variant="outline"
               asChild
             >
-              <Link href="/">
+              <StaticLink href="/">
                 <Home className="w-5 h-5 mr-2" />
                 返回首页
-              </Link>
+              </StaticLink>
             </Button>
           </div>
 
@@ -77,7 +77,7 @@ export default function Error({
             </h3>
 
             <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
-              <Link
+              <StaticLink
                 href="/contact"
                 className="flex items-center p-4 bg-white rounded-lg hover:shadow-md transition-shadow group"
               >
@@ -88,9 +88,9 @@ export default function Error({
                   <div className="font-semibold text-[#1C1C1C]">联系我们</div>
                   <div className="text-sm text-[#5C5C5C]">获取技术支持</div>
                 </div>
-              </Link>
+              </StaticLink>
 
-              <Link
+              <StaticLink
                 href="/services"
                 className="flex items-center p-4 bg-white rounded-lg hover:shadow-md transition-shadow group"
               >
@@ -101,15 +101,15 @@ export default function Error({
                   <div className="font-semibold text-[#1C1C1C]">核心业务</div>
                   <div className="text-sm text-[#5C5C5C]">了解我们的服务</div>
                 </div>
-              </Link>
+              </StaticLink>
             </div>
           </div>
 
           <div className="mt-8 text-sm text-[#5C5C5C]">
             如果问题持续存在，请{' '}
-            <Link href="/contact" className="text-[#C41E3A] hover:underline">
+            <StaticLink href="/contact" className="text-[#C41E3A] hover:underline">
               联系我们的技术团队
-            </Link>
+            </StaticLink>
           </div>
         </div>
       </div>