Create/Update/Deactivate handlers con TransactionScope + audit; validators FluentValidation; DI wiring NullProductQueryRepository + 5 handlers; SqlTestFixture V017 + permiso count 25→26.
Create/Update/Deactivate handlers con TransactionScope + audit; validators FluentValidation; DI wiring NullProductQueryRepository + 5 handlers; SqlTestFixture V017 + permiso count 25→26.