fix: resolve html invalid nesting, english routing 404s, and nodemailer missing credentials

next.config.mjs

@@ -393,6 +393,7 @@ const nextConfig = {
   },
   images: {
     formats: ['image/webp'],
+    deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
     remotePatterns: [
       {
         protocol: 'https',
@@ -402,6 +403,14 @@ const nextConfig = {
         protocol: 'https',
         hostname: '*.klz-cables.com',
       },
+      {
+        protocol: 'http',
+        hostname: 'klz-cables.com',
+      },
+      {
+        protocol: 'http',
+        hostname: '*.klz-cables.com',
+      },
       {
         protocol: 'http',
         hostname: 'klz.localhost',
@@ -427,6 +436,31 @@ const nextConfig = {
           source: '/de/kontakt',
           destination: '/de/contact',
         },
+        // Safety rewrites for English locale using German slugs (legacy or content errors)
+        {
+          source: '/en/produkte',
+          destination: '/en/products',
+        },
+        {
+          source: '/en/produkte/:path*',
+          destination: '/en/products/:path*',
+        },
+        {
+          source: '/en/kontakt',
+          destination: '/en/contact',
+        },
+        {
+          source: '/en/impressum',
+          destination: '/en/legal-notice',
+        },
+        {
+          source: '/en/datenschutz',
+          destination: '/en/privacy-policy',
+        },
+        {
+          source: '/en/agbs',
+          destination: '/en/terms',
+        },
       ],
       afterFiles: [],
       fallback: [],