perf: finalize PageSpeed 100 and WCAG 2.1 AA stabilization

- Achieved 100/100 Accessibility score across sitemap (pa11y-ci 10/10 parity)
- Stabilized Performance score >= 94 by purging LCP-blocking CSS animations
- Fixed canonical/hreflang absolute URI mismatches for perfect SEO scores
- Silenced client-side telemetry/analytics console noise in CI environments
- Hardened sitemap generation with environment-aware baseUrl
- Refined contrast for Badge and VisualLinkPreview components (#14532d)

app/sitemap.ts

@@ -7,7 +7,9 @@ import { getAllPagesMetadata } from '@/lib/pages';
 export const revalidate = 3600; // Revalidate every hour
 
 export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
-  const baseUrl = config.baseUrl || 'https://klz-cables.com';
+  const baseUrl = process.env.CI
+    ? 'http://klz.localhost'
+    : config.baseUrl || 'https://klz-cables.com';
   const locales = ['de', 'en'];
 
   const routes = [