Auto-provisioning of OIDC users

Hi all,

is there a possibility to automatically register users in Huly once they're logged in via OIDC?

Currently, when you try to log in via OIDC without having a Huly account first, you're returned to the login screen with no error message shown in the frontend.

Looking at the account container log, it says:

```
{"email":"testuser@test.com","level":"info","message":"Failed to auth: no associated account found","timestamp":"2025-08-12T11:50:11.963Z","type":"openid","user":{"email":"testuser@test.com","email_verified":true,"family_name":"User","given_name":"Test","name":"Test User","preferred_username":"testuser@test.com","sub":"redacted"}}
```

Additionally, is it possible to remove the built-in sign-in entirely, and only allow single sign-on with OIDC?