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]/contact/page.tsx

@@ -35,7 +35,6 @@ export async function generateMetadata({ params }: ContactPageProps): Promise<Me
       description,
       url: `${SITE_URL}/${locale}/contact`,
       siteName: 'KLZ Cables',
-      images: getOGImageMetadata('contact', title, locale),
       locale: `${locale.toUpperCase()}_DE`,
       type: 'website',
     },
@@ -43,7 +42,6 @@ export async function generateMetadata({ params }: ContactPageProps): Promise<Me
       card: 'summary_large_image',
       title: `${title} | KLZ Cables`,
       description,
-      images: [`${SITE_URL}/${locale}/contact/opengraph-image`],
     },
     robots: {
       index: true,