Add single export method to service.

[KevinJump]

Adds a ExportSingleItem method to the service so you can just export one thing if you want to.

to used in the main export flow but here to provide a quick way to do it.

https://forum.umbraco.com/t/usync-api-for-a-single-item/7802/7

[Copilot]

Pull request overview

Adds a new service-level API to export a single item (by Udi) using the appropriate sync handler, intended as a helper for consumers who don’t want to run a full export flow.

Changes:

• Add ExportSingleItem(Udi udi, string[] folders, SyncHandlerOptions options) to ISyncService.
• Implement ExportSingleItem in SyncService by resolving a handler via entity type and delegating to ExportAsync.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
uSync.BackOffice/Services/SyncService_Single.cs	Implements the new single-item export method by resolving a handler from the UDI entity type and exporting via the handler.
uSync.BackOffice/Services/ISyncService.cs	Extends the service interface with the new single-item export method signature.

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