curl --request POST \
  --url https://auth.platform.arb.inc/organizations/list \
  --header 'Authorization: Bearer <token>'

{
  "organizations": [
    {
      "id": "2720f109-0caf-4c62-af22-5d08c853711c",
      "created": "2025-08-15T10:30:00.000Z",
      "invitedBy": "8f3a4b2c-1d5e-4f6a-9b7c-3e2d1a0b9c8d"
    }
  ]
}