The identity of the endpoint a model list would come from, or null when
the list must not be fetched on its own.
Auto-loading needs a key: an endpoint that requires auth would answer 401,
and one that does not is the operator's call — the settings form keeps the
button available for that. The value doubles as a "already tried this
pair" marker, so a re-render does not re-fetch.
The identity of the endpoint a model list would come from, or
nullwhen the list must not be fetched on its own.Auto-loading needs a key: an endpoint that requires auth would answer 401, and one that does not is the operator's call — the settings form keeps the button available for that. The value doubles as a "already tried this pair" marker, so a re-render does not re-fetch.