Marketplace app iframes (Penpot, Gitea, IndeedHub, ...) can POST a file
to /api/share-to-mesh and postMessage the returned CID to the parent
window. The endpoint mirrors /api/blob's body format but adds CORS for
the requesting app origin (any port on host_ip) so proxied apps can
reach it with credentials:'include'. Session cookie is still the primary
auth; the origin check is a sanity guard.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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