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]/[slug]/page.tsx

@@ -5,7 +5,6 @@ import { getTranslations, setRequestLocale } from 'next-intl/server';
 import { Metadata } from 'next';
 import { getPageBySlug, getAllPages } from '@/lib/pages';
 import { mdxComponents } from '@/components/blog/MDXComponents';
-import { getOGImageMetadata } from '@/lib/metadata';
 import { SITE_URL } from '@/lib/schema';
 
 interface PageProps {
@@ -50,7 +49,6 @@ export async function generateMetadata({ params }: PageProps): Promise<Metadata>
       title: `${pageData.frontmatter.title} | KLZ Cables`,
       description: pageData.frontmatter.excerpt || '',
       url: `${SITE_URL}/${locale}/${slug}`,
-      images: getOGImageMetadata(slug, pageData.frontmatter.title, locale),
     },
     twitter: {
       card: 'summary_large_image',