Default Model Setting

[Ralf-Brauchler]

Description:

There is currently no way to set a default model. GPT-5 takes a long time to respond, and I usually use Sonnet, but the default is always GPT-5. This issue proposes implementing a feature to allow users to select a default model.

Tasks:

• Implement Default Model Setting: Develop a setting within the user preferences or admin panel to allow the selection of a default model.
• Apply Default Model: Ensure that the selected default model is automatically used for new chats or requests.
• Persist Default Model Setting: Ensure that the selected default model is persisted across sessions.

Acceptance Criteria:

• Users can select a default model from a list of available models.
• The selected default model is automatically used for new chats or requests.
• The selected default model setting is persisted across sessions.