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/(marketing)/news/[slug]/NewsDetailClient.tsx

@@ -1,10 +1,10 @@
 'use client';
 
-import Link from 'next/link';
+import { StaticLink } from '@/components/ui/static-link';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { BackButton } from '@/components/ui/back-button';
-import { Calendar } from 'lucide-react';
+import { Calendar, ArrowLeft } from 'lucide-react';
 import { motion } from 'framer-motion';
 import { useInView } from 'framer-motion';
 import { useRef } from 'react';
@@ -72,7 +72,7 @@ export function NewsDetailClient({ news }: NewsDetailClientProps) {
               </h2>
               <div className="grid md:grid-cols-3 gap-6">
                 {relatedNews.map((related) => (
-                  <Link key={related.id} href={`/news/${related.id}`}>
+                  <StaticLink key={related.id} href={`/news/${related.id}`}>
                     <div className="group cursor-pointer">
                       <div className="aspect-video bg-linear-to-br from-[#C41E3A]/10 to-[#1C1C1C]/10 rounded-lg mb-4 flex items-center justify-center group-hover:shadow-lg transition-shadow">
                         <span className="text-4xl">📰</span>
@@ -87,23 +87,24 @@ export function NewsDetailClient({ news }: NewsDetailClientProps) {
                         {related.excerpt}
                       </p>
                     </div>
-                  </Link>
+                  </StaticLink>
                 ))}
               </div>
             </div>
           )}
 
           <div className="mt-16 flex justify-center gap-4">
-            <Link href="/news">
+            <StaticLink href="/news">
               <Button variant="outline" size="lg">
+                <ArrowLeft className="w-4 h-4 mr-2" />
                 返回新闻列表
               </Button>
-            </Link>
-            <Link href="/contact">
+            </StaticLink>
+            <StaticLink href="/contact">
               <Button size="lg" className="bg-[#C41E3A] hover:bg-[#A01830] text-white">
                 联系我们
               </Button>
-            </Link>
+            </StaticLink>
           </div>
         </motion.div>
       </div>