auto login or login/logout api?

## Is your feature request related to a problem? Please describe

I want to integrate answers with existing account system.

## Describe the solution you'd like

If I can auto-login user with existing id or call login/logout API, Then the two systems will work together perfectly.

## Describe alternatives you've considered

Or exposing session token generation api / logic?

The issue does not identify files, tests, or entry points; begin by locating the existing account and session authentication flows. Clarify the integration contract for auto-login, login/logout APIs, or session-token generation, then define and test the selected behavior for interoperability with an external account system.

Written by the indexing model from the issue text.