feat: Add generateCategoryMetaTags function for enhanced SEO in category pages and integrate it into prerender process

prerender/seo/category.cjs

@@ -1,3 +1,43 @@
+/** Safe for double-quoted HTML attributes */
+const escAttr = (str) =>
+  String(str ?? "")
+    .replace(/&/g, "&")
+    .replace(/"/g, """)
+    .replace(/</g, "&lt;");
+
+/**
+ * Head tags for prerendered category URLs — explicit canonical per /Kategorie/{slug}
+ * so Google does not cluster different listing pages (e.g. neu vs Seeds) as duplicates.
+ */
+const generateCategoryMetaTags = (category, baseUrl, config) => {
+  const root = baseUrl.endsWith("/") ? baseUrl.slice(0, -1) : baseUrl;
+  const categoryUrl = `${root}/Kategorie/${category.seoName}`;
+  const name = category.name || `Kategorie ${category.seoName}`;
+  const site = config.siteName || config.brandName;
+  const desc = `${name} bei ${config.brandName}: Growshop-Sortiment online kaufen. Schnelle Lieferung, Laden Dresden.`;
+  const descShort = desc.length > 160 ? `${desc.slice(0, 157)}...` : desc;
+  const e = escAttr;
+  const logoUrl =
+    config.images && config.images.logo
+      ? `${root}${config.images.logo}`
+      : `${root}/assets/images/nopicture.jpg`;
+
+  return `
+    <meta name="description" content="${e(descShort)}">
+    <meta property="og:title" content="${e(`${name} | ${site}`)}">
+    <meta property="og:description" content="${e(descShort)}">
+    <meta property="og:url" content="${categoryUrl}">
+    <meta property="og:type" content="website">
+    <meta property="og:image" content="${e(logoUrl)}">
+    <meta property="og:site_name" content="${e(site)}">
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:title" content="${e(`${name} | ${site}`)}">
+    <meta name="twitter:description" content="${e(descShort)}">
+    <meta name="robots" content="index, follow">
+    <link rel="canonical" href="${categoryUrl}">
+  `;
+};
+
 const generateCategoryJsonLd = (category, products = [], baseUrl, config) => {
   // Category IDs to skip (seeds, plants, headshop items)
   const skipCategoryIds = [689, 706, 709, 711, 714, 748, 749, 896, 710, 924, 923, 922, 921, 916, 278, 259, 258];
@@ -173,5 +213,6 @@ const generateCategoryJsonLd = (category, products = [], baseUrl, config) => {
 };
 
 module.exports = {
+  generateCategoryMetaTags,
   generateCategoryJsonLd,
-}; 
+};