Function create_model_provider_from_ref_with_model 

pub fn create_model_provider_from_ref_with_model(
    config: &Config,
    name: &str,
) -> Result<ResolvedModelProviderRef>

Resolve a provider reference and its alias-owned model as one materialized view. Callers may apply their own explicit model override after resolution; when the reference is bare or URL-based, model is None.