greebo c7c9184a71 feat: add optimistic concurrency guards for draft editor, pricing and publish flows ...

add optimistic concurrency guards via expected scheme version id

protect draft editor, pricing snapshot, remap and publish flows from stale mutations
protect version creation from stale current version state

keep backward compatibility with optional query guards

verify 409 conflict behavior for stale clients and 200 for valid flows

2026-03-19 18:58:03 +03:00

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