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)/home-content.tsx

@@ -46,17 +46,7 @@ const NewsSection = dynamic(
   }
 );
 
-interface SiteConfig {
-  feature_services?: { enabled: boolean; items: string[] };
-  feature_products?: { enabled: boolean; showPricing: boolean; featuredProducts: string[] };
-  feature_news?: { enabled: boolean; displayCount: number; categories: string[]; sortOrder: 'asc' | 'desc' };
-}
-
-interface HomeContentProps {
-  config: SiteConfig;
-}
-
-function HomeContent({ config }: HomeContentProps) {
+function HomeContent() {
   const searchParams = useSearchParams();
 
   useEffect(() => {
@@ -74,18 +64,14 @@ function HomeContent({ config }: HomeContentProps) {
     return undefined;
   }, [searchParams]);
 
-  const showServices = config.feature_services?.enabled !== false;
-  const showProducts = config.feature_products?.enabled !== false;
-  const showNews = config.feature_news?.enabled !== false;
-
   return (
     <main className="min-h-screen bg-white dark:bg-(--color-bg-primary)">
       <HeroSection />
-      {showServices && <ServicesSection config={config.feature_services} />}
-      {showProducts && <ProductsSection config={config.feature_products} />}
+      <ServicesSection />
+      <ProductsSection />
       <CasesSection />
       <AboutSection />
-      {showNews && <NewsSection config={config.feature_news} />}
+      <NewsSection />
     </main>
   );
 }