Laura NetoandGitHub 2f520981aa Extension template: Use backoffice JSON options and other fixes (#22885)
* Extension template: Configure BackOffice JSON options and replace IUser response with WhoAmIResponseModel

Sets the extension template's backoffice API to use the BackOffice named JsonOptions so the extension's serializer is insulated from consumer-level overrides.

The sample whoAmI endpoint previously returned IUser directly. IUser is a Umbraco.Core domain interface, not an API contract - it has no JSON polymorphism configuration and its nested interface properties (e.g. IReadOnlyUserGroup) are not designed to be serialized as part of an HTTP response. Once the BackOffice JsonOptions activated UmbracoJsonTypeInfoResolver for the extension's OpenAPI document, schema generation produced incomplete output (no type information on the Groups property).

Replaces the return type with a flat WhoAmIResponseModel exposing only the fields the dashboard UI consumes (name, email, groups). Domain interfaces should not be exposed directly on a controller - always project into a dedicated response model.

* Extension template: Fully-qualify Cms.Core references and drop Umbraco.Extensions import

The composer and controller base referenced `Cms.Core.Constants...` in short form, which relied on namespace fallback from `Umbraco.Extension.Controllers` finding `Umbraco.Cms.Core`. When consumers instantiate the template with a non-Umbraco root namespace, that fallback breaks. References are now fully qualified as `Umbraco.Cms.Core.Constants...`.

Additionally, the `whoAmI` controller's `using Umbraco.Extensions;` was getting mangled by the template engine's token substitution of `Umbraco.Extension` into the consumer's name. Replaces `WhereNotNull()` with the BCL-only `OfType<string>()` so the controller no longer depends on the `Umbraco.Extensions` namespace.

* Extension template: Tighten whoAmI 204 guard in dashboard

The generated client returns a truthy empty data object (or null body) for a 204 response, so the previous `if (data)` check could pass and render `undefined` values in the notification. Checks `data?.email` instead - it's a required field on a real 200 response and absent in the 204 fallback.

* Extension template: Return 401 Unauthorized from whoAmI and simplify dashboard handling

When `BackOfficeSecurity.CurrentUser` is null, the sample `whoAmI` endpoint now returns `Unauthorized()` instead of `NoContent()`, matching the `GetCurrentUserController` pattern in the Management API. Drops the 204 ProducesResponseType so the OpenAPI spec only advertises 200 plus the framework-emitted 401.

The dashboard collapses its empty-data check into a single `error || !data` guard, moves the notification into the success branch, and regenerates the client to drop the now-unused 204 response.
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