Add LDAP as a third authentication option alongside local password and
Microsoft Entra ID SSO. Per-tenant configuration supports Active Directory,
OpenLDAP, and FreeIPA with configurable attribute mapping, search-then-bind
and direct-bind methods, encrypted bind credentials (AES-256-GCM),
profile sync on login, and user auto-provisioning via external identity
linking.
Includes admin UI for connection settings with test-connection button,
login page LDAP form, 25 new PHPUnit tests, and de/en translations.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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