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/sections/about-section.tsx

@@ -3,7 +3,7 @@
 import { motion } from 'framer-motion';
 import { useInView } from 'framer-motion';
 import { useRef } from 'react';
-import Link from 'next/link';
+import { StaticLink } from '@/components/ui/static-link';
 import { Card, CardContent } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 import { COMPANY_INFO, STATS } from '@/lib/constants';
@@ -66,10 +66,10 @@ export function AboutSection() {
             className="text-center"
           >
             <Button size="lg" variant="outline" className="group" asChild>
-              <Link href="/about">
+              <StaticLink href="/about">
                 了解更多关于我们
                 <ArrowRight className="ml-2 w-4 h-4 transition-transform group-hover:translate-x-1" />
-              </Link>
+              </StaticLink>
             </Button>
           </motion.div>
         </motion.div>