Fix binary data decoding error: Remove objectGUID field from LDAP models

- Removed objectGUID field from LdapUser, LdapGroup, and LdapOrganizationalUnit models
- objectGUID contains binary data that causes UnicodeDecodeError when decoded as UTF-8
- Field is not critical for core functionality
- Updated admin.py to not use object_guid attribute

backend/employees/admin.py

@@ -778,7 +778,7 @@ class EmployeeAdmin(DjangoUserAdmin):
                     object_pk=str(employee.pk),
                     defaults={
                         'ldap_dn': ldap_user.dn,
-                        'ldap_guid': str(ldap_user.object_guid) if hasattr(ldap_user, 'object_guid') else None,
+                        'ldap_guid': None,  # objectGUID удален из модели
                         'last_sync_dir': 'ldap',
                     }
                 )

backend/employees/ldap/orm_models.py

@@ -207,7 +207,7 @@ class LdapUser(LdapSyncStateMixin, ModifyDnMixin, LdapModel):
     cn = CharField(db_column='cn')
     
     # Идентификация
-    object_guid = CharField(db_column='objectGUID')
+    # objectGUID исключен из-за проблем с декодированием бинарных данных
     sam_account_name = CharField(db_column='sAMAccountName')
     user_principal_name = CharField(db_column='userPrincipalName')
     
@@ -288,7 +288,7 @@ class LdapGroup(ModifyDnMixin, LdapModel):
     cn = CharField(db_column='cn')
     
     # Идентификация
-    object_guid = CharField(db_column='objectGUID')
+    # objectGUID исключен из-за проблем с декодированием бинарных данных
     sam_account_name = CharField(db_column='sAMAccountName')
     
     # Описание
@@ -350,7 +350,7 @@ class LdapOrganizationalUnit(ModifyDnMixin, LdapModel):
     ou = CharField(db_column='ou')
     
     # Идентификация
-    object_guid = CharField(db_column='objectGUID')
+    # objectGUID исключен из-за проблем с декодированием бинарных данных
     
     # Описание
     description = CharField(db_column='description', blank=True)