CorpusListGet_UserCustomSerializer_V2_1

Adds organization-aware is_superuser and is_staff serializer fields.

The values are derived from the user's organization relations rather than
Django's global flags.

{ "id": 0, "email": "[email protected]", "is_superuser": true, "first_name": "string", "last_name": "string", "organization": { "id": 0, "org_name": "string" } }