refactor: Replace hardcoded domain with SITE_URL constant across metadata and schema definitions for improved configurability.

app/robots.ts

@@ -1,6 +1,8 @@
+import { config } from '@/lib/config';
 import { MetadataRoute } from 'next';
 
 export default function robots(): MetadataRoute.Robots {
+  const baseUrl = config.baseUrl || 'https://klz-cables.com';
   return {
     rules: [
       {
@@ -11,8 +13,8 @@ export default function robots(): MetadataRoute.Robots {
       {
         userAgent: ['GPTBot', 'ClaudeBot', 'PerplexityBot', 'Google-Extended', 'OAI-SearchBot'],
         allow: '/',
-      }
+      },
     ],
-    sitemap: 'https://klz-cables.com/sitemap.xml',
+    sitemap: `${baseUrl}/sitemap.xml`,
   };
 }