Public endpoint to get VitalSource configuration for any organization.
This is accessible to anonymous users and authenticated users alike.
This is needed for the frontend to check buyOnVitalsource flag without
requiring authentication or organization permissions.

GET /services/account/organizations/1/vitalsource-config/?format=api
HTTP 200 OK
Allow: OPTIONS, GET
Content-Type: application/json
Vary: Accept

{
    "id": 1,
    "buyOnVitalsource": true,
    "showVsModal": false
}