feat(seo): prioritize short description for product meta tags

Now uses `kurzBeschreibung` for SEO meta description if available,
falling back to full `description` or name/article number otherwise.
This improves relevance and conciseness of meta tags.

prerender/seo/product.cjs

@@ -8,13 +8,19 @@ const generateProductMetaTags = (product, baseUrl, config) => {
           .trim()}.jpg`
       : `${baseUrl}/assets/images/nopicture.jpg`;
 
+
   // Clean description for meta (remove HTML tags and limit length)
-  const cleanDescription = product.description
-    ? product.description
+  const cleanDescription = product.kurzBeschreibung
+    ? product.kurzBeschreibung
         .replace(/<[^>]*>/g, "")
         .replace(/\n/g, " ")
         .substring(0, 160)
-    : `${product.name} - Art.-Nr.: ${product.articleNumber}`;
+    : product.description
+      ? product.description
+          .replace(/<[^>]*>/g, "")
+          .replace(/\n/g, " ")
+          .substring(0, 160)
+      : `${product.name} - Art.-Nr.: ${product.articleNumber}`;
 
   return `
     <!-- SEO Meta Tags -->