cleanup: Remove duplicate cookie-banner route, redirect to /sdk/cookie-banner

- Deleted 6 unused components from /sdk/einwilligungen/cookie-banner/_components/
- Replaced page.tsx with Next.js redirect() to /sdk/cookie-banner
- Updated EinwilligungenNavTabs link to /sdk/cookie-banner
- Updated catalog page link to /sdk/cookie-banner
- Single source of truth: /sdk/cookie-banner (Step in "Rechtliche Texte")

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/einwilligungen/catalog/page.tsx

@@ -130,7 +130,7 @@ function CatalogContent() {
         </Link>
 
         <Link
-          href="/sdk/einwilligungen/cookie-banner"
+          href="/sdk/cookie-banner"
           className="bg-white rounded-xl border border-slate-200 p-4 hover:border-indigo-300 hover:shadow-md transition-all group"
         >
           <div className="flex items-center justify-between">