lith/Caddyfile: actually let Kubo own the ipfs CORS header
The "restore Caddy-side CORS" commit reintroduced the "*, *" dupe. Kubo IS
emitting Access-Control-Allow-Origin: * after all — the earlier test that
showed zero headers was a Cloudflare-cached response from the immediately
prior broken deploy. Drop Caddy's header directive and let Kubo own it.
If the browser still sees "*, *" after a deploy, bust the Cloudflare cache
before debugging further.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>