Reduce the display of models in the model dropdown list.

[Emt-lin]

Is your feature request related to a problem? Please describe.

In the dropdown list, such models without an API key are displayed.

Describe the solution you'd like only show copilot-plus-flash(paid)、google/gemini-2.5-flash(free) model for default setting.

Additional context Add any other context or screenshots about the feature request here.