- Add upstream_oauth2_config with Authentik provider credentials
- Configure OIDC with client_id and client_secret from Authentik
- Disable local password authentication (OIDC-only login)
- Set claims mapping: subject, localpart, displayname, email
This enables users to login via Authentik OIDC provider with email
and username claims properly mapped for Matrix user provisioning.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>