Samba / AD-DC compatibility for the LDAP outpost

## What

Samba/AD-DC compatibility for the LDAP outpost (Samba schema + use outpost as a Samba DC).

## Want

- Samba/AD-DC compatibility for the LDAP outpost (Samba schema + use outpost as a Samba DC)

## Ideas this came from

- [#8711 Add Samba Schema](https://github.com/goauthentik/authentik/issues/8711) — I would like to be able to use Authenik as a means to authenticate Samba users via LDAP. failed to add domain dn= sambaDomainName something like a an LDIF or gi
- [#19789 LDAP-Outpost as Samba Domain Controller](https://github.com/goauthentik/authentik/issues/19789) — Is your feature request related to a problem? I have an QNAP device that fails to interact properly with authentik. The problem is that the QNAP device has some

Start by reviewing the LDAP outpost context and the linked issues #8711 and #19789 to understand the requested Samba schema and AD-DC behavior. Define acceptance criteria for Samba compatibility before locating implementation files and tests; done means the outpost supports the requested schema and can be used as a Samba domain controller.

Written by the indexing model from the issue text.