Each post is now a folder: meta.md (shared metadata) + one file per
language (fr.md / en.md) carrying the localized title and body.
Language files go where the existing prose actually is: hello-world
and hello-world-again are French, next is English. Share tokens
(8x6nki, szm8ld) move to meta.md so the unlisted /blog/d/ URLs keep
working; the post image stays in public/images (no move needed).
