feat: implement frontend-backend configuration linkage

- Create public config API for frontend consumption
- Add configuration fetching to homepage
- Implement module show/hide logic based on config
- Add support for Services items filtering
- Add support for Products featured products and pricing display
- Add support for News display count, categories, and sort order
- Fix table name from 'configs' to 'siteConfig' in API route
- Update type definitions for proper TypeScript support

src/components/layout/header.tsx

@@ -200,9 +200,8 @@ function HeaderContent() {
               <Button 
                 size="sm"
                 asChild
-                data-testid="consult-button"
               >
-                <Link href="/contact">立即咨询</Link>
+                <Link href="/contact" data-testid="consult-button">立即咨询</Link>
               </Button>
             </div>