- Add ProviderCategory type with official, cn_official, aggregator, third_party, and custom categories
- Update Provider interface and Rust struct to include optional category field
- Enhance ProviderForm to automatically sync category when selecting presets
- Improve PresetSelector to show category-based styling and hints
- Add category classification to all provider presets
- Support differentiated interactions (e.g., hide API key input for official providers)
- Maintain backward compatibility with existing configurations
- Restore backend commands to accept app_type/app/appType with priority app_type
- Frontend invoke() now passes both { app_type, app } again
- Revert CSS change that set pointer-events: none on segmented-thumb
- Keep minor fix: open_config_folder signature uses handle + respects both names
Note: warnings for non_snake_case (appType) are expected for compatibility.
