fix(og-image): resolve 404s, migrate middleware to proxy.ts, and fix local port conflict

app/[locale]/[slug]/opengraph-image.tsx

@@ -3,6 +3,8 @@ import { getPageBySlug } from '@/lib/pages';
 import { OGImageTemplate } from '@/components/OGImageTemplate';
 import { getOgFonts, OG_IMAGE_SIZE } from '@/lib/og-helper';
 
+export const size = OG_IMAGE_SIZE;
+export const contentType = 'image/png';
 export const runtime = 'nodejs';
 
 export default async function Image({