Improve the model list section in PersonalSetting component with the following enhancements:
- Add category-based tabs for filtering models by provider (OpenAI, Anthropic, etc.)
- Implement skeleton loading states using Semi UI components
- Add empty state illustrations when no models are available
- Use Semi UI design tokens for consistent styling
- Optimize display for both expanded and collapsed model lists
- Simplify some button text labels for better UI consistency
