fix(og): enable automatic OG image discovery and refine Traefik whitelist

- Removed manual 'images' metadata overrides.
- This allows Next.js to use built-in automatic discovery.
- Ensures metadata uses the dynamic metadataBase from the environment.
- Refined Traefik public router regex for sub-routes.
- Restored and verified imports in modified page.tsx files.

app/[locale]/blog/page.tsx

@@ -3,8 +3,8 @@ import Image from 'next/image';
 import { getAllPosts } from '@/lib/blog';
 import { Section, Container, Heading, Card, Badge, Button } from '@/components/ui';
 import Reveal from '@/components/Reveal';
+import { Metadata } from 'next';
 import { getTranslations } from 'next-intl/server';
-import { getOGImageMetadata } from '@/lib/metadata';
 import { SITE_URL } from '@/lib/schema';
 
 interface BlogIndexProps {
@@ -31,7 +31,6 @@ export async function generateMetadata({ params }: BlogIndexProps) {
       title: `${t('title')} | KLZ Cables`,
       description: t('description'),
       url: `${SITE_URL}/${locale}/blog`,
-      images: getOGImageMetadata('blog', t('title'), locale),
     },
     twitter: {
       card: 'summary_large_image',