#45 feat: implement automatic model selection in web UI

Implement intelligent automatic model selection in the web UI that builds on the enhanced /api/models endpoint. ## Features Implemented: 1. **Enhanced API Integration**: TypeScript interfaces for model data and API responses 2. **AutoModelSelector Utility**: Architecture-aware model selection logic 3. **ModelSelectionContext**: State management for model selection across components 4. **Enhanced Model Selection Components**: Visual indicators and automatic selection 5. **Updated Generation Pages**: Automatic VAE selection for text2img, img2img, inpainting, and upscaler 6. **Architecture-Specific Logic**: Proper model selection for all model types (SD1.5, SD2.0, SDXL, SVD, etc.) 7. **Visual Feedback**: Model selection indicators showing compatibility and status ## Files Added/Modified: - `webui/lib/api.ts` - Enhanced API integration with TypeScript interfaces - `webui/lib/auto-model-selector.ts` - New utility class for automatic model selection - `webui/contexts/model-selection-context.tsx` - New context provider for state management - `webui/components/enhanced-model-select.tsx` - Enhanced model selection component - `webui/components/model-selection-indicator.tsx` - Visual indicator component - `webui/components/ui/select.tsx` - New UI component based on Radix UI - `webui/app/text2img/page.tsx` - Add automatic VAE selection - `webui/app/img2img/page.tsx` - Add automatic VAE selection - `webui/app/inpainting/page.tsx` - Add automatic VAE selection - `webui/app/upscaler/page.tsx` - Enhanced model selection ## Benefits: - Significantly improved user experience with automatic model selection - Reduced user errors by selecting compatible models automatically - Visual indicators help users understand model compatibility - Architecture-aware selection ensures proper model combinations - Maintains backward compatibility with existing manual selection This enhancement builds on the enhanced /api/models endpoint (issue #44) and provides a much more intuitive and user-friendly interface for model selection.