The OG function deployed and worked (`/api/og?v=<nevent>` returns the real
title, description, thumbnail and player card), but crawlers hitting
`/?v=<nevent>` still got the site-wide card: Vercel evaluates `rewrites` AFTER
the filesystem, and `/` matches the static index.html, so the rewrite never
fired.
Middleware runs before the filesystem check, so that is where the routing
belongs. Replace the dead `rewrites` block with a root middleware that matches
only `/`, bails immediately when there is no `v` param or the user-agent is not
a known preview crawler, and otherwise rewrites to /api/og.
Real viewers are unaffected -- they fall through to the untouched SPA. Note the
one behavioral difference from the rewrite design: middleware now executes on
homepage requests (matcher is `/` only) rather than being invoked solely for
crawlers. It returns next() after two cheap checks.
Verified on the live unstable deployment that /api/og already renders
`x-bitvid-og: video` with og:type video.other for the real note; this only
fixes how crawlers reach it.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
