- Eliminated the 'isDefault' field from model settings and related service logic, simplifying model management.
- Updated UI components to remove references to default models, ensuring a cleaner user experience.
- Adjusted backend model creation and update processes to reflect the removal of default model selection logic.
- Introduced `is_builtin` property in the model configuration to identify builtin models.
- Updated frontend components to display a tag for builtin models in the ModelSelector and ModelSettings.
- Enhanced the ModelEditorDialog to prevent editing and deletion of builtin models.
- Implemented logic in the backend to hide sensitive information for builtin models and restrict their modification.
- Added informative UI elements to clarify the nature of builtin models in the settings and editor views.
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