The admin set-admin-flag, set-status and delete-user operations were
implemented twice — once in the v1 echo handlers, once in the v2 Huma handlers.
Extract the load/guard/mutate logic into models.SetUserAdminFlag,
models.SetUserStatusAsAdmin and models.DeleteUserAsAdmin so both APIs call the
same code; each handler keeps only its own request binding, validation and
response shape. v1 stays byte-identical on the wire.
Move the admin overview computation and struct into models.BuildOverview /
models.Overview, the admin create-user flow into models.CreateUserAsAdmin /
models.CreateUserBody, and the admin user response view into a new
pkg/routes/api/shared package (shared.AdminUser / shared.NewAdminUser) so both
the v1 and v2 admin routes call the same code. The v1 handlers are refactored
onto these helpers and stay byte-identical on the wire.
The admin create-user handler returned the in-memory newUser struct directly. On mail-enabled instances with skip_email_confirm=false, user.CreateUser persists the account as email-confirmation-required, but the returned struct still reflects the pre-persist status, so the admin API reported a misleading active status immediately after creation.