list: API endpoint for returning a list of condition concepts that aggregate equivalent conditions across game systems.
retrieve: API endpoint for returning a particular condition concept.

Condition concepts represent the same conceptual condition (e.g., "Invisible")
across different game systems, providing a unified view with links to the
system-specific implementations.

GET /v2/condition-concepts/?format=api&ordering=key
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "count": 0,
    "next": null,
    "previous": null,
    "results": []
}