Consider deprecating old auth API

**Feature request**
It would be great to have import for store.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_import` with default `false`.

No file or test is named. Start by locating the existing auth API, store handling, and configuration definitions, then clarify whether the requested import concerns the store or auth deprecation; done requires an agreed behavior for enable_import, including its default and production-deployment effect.

Written by the indexing model from the issue text.