fix(seo): exclude noindex pages from sitemap via routeRules

Add sitemap: false to imprint and privacy routeRules so noindex pages
stop appearing in the sitemap, avoiding wasted crawl budget.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: TheMeinerLP

nuxt.config.ts

@@ -77,6 +77,12 @@ export default defineNuxtConfig({
             priority: 0.8
         }
     },
+    routeRules: {
+        '/en/imprint': { index: false },
+        '/de/imprint': { index: false },
+        '/en/privacy': { index: false },
+        '/de/privacy': { index: false },
+    },
 
     vite: {
         plugins: [tailwindcss()],