FrontOfficeApiController.AcceptQuery/RejectQuery now resolve the actor
(provider vs client vs admin) from the query's PerformerId/ClientId and
authorize accordingly — a non-party caller is forbidden. Either party may
accept or reject. Acceptance may carry a PostIt signature, which is staged
on the query's linked estimate (Estimate.CommandId == queryId) and sets the
estimate's ProviderValidationDate / ClientValidationDate; a signature with
no linked estimate, or a signature on a reject, returns 400. Admin bypasses
authz but cannot sign.
The shared signature-staging logic (find-or-add the Signature row by
(EstimateId, Type), write Strokes/CoordinateMax/CapturedAtUtc) is extracted
into EstimateSignaturePersister, and BillingController.Sign now calls it.
The persister owns no disk I/O and no SaveChanges — the caller persists in
its own transaction.
Signature.Strokes is now the sole source of truth: drop the FilePath
property, remove the on-disk EstimateSignatureFileHelper (and its tests),
and add the DropSignatureFilePath migration. The legacy PNG prosign/clisign
flow is independent of Signature.FilePath and is unchanged.
Co-Authored-By: Claude Code <noreply@anthropic.com>
