CatalogController gains platform-admin-gated writes: create a plan,
create a draft version (with its plan items, transactionally), publish
a version, create an addon — plus a plan-detail endpoint exposing every
version. Pricing stays versioned: create_version always makes a new
draft, publish retires the prior active version, existing subscriptions
are untouched. The Catalog context functions already existed; this just
exposes them over HTTP.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Giuliano Silvestro
34fd811e91