greebo a266f56ddd feat(backend): harden draft, pricing and publish contracts ...

- unify typed API errors across draft, pricing and publish flows
- add stale draft and publish-state mutation guards
- add publish readiness contract and guarded publish flow
- add sellability reason codes to test seat preview
- add pricing diagnostics and strengthen snapshot/publish lifecycle consistency

2026-03-19 20:58:14 +03:00

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