Create framework-agnostic keybinding package following domain-driven design patterns.
Move pure business logic to package while keeping Vue integration in workbench layer.
Changes:
- Add @comfyorg/keybinding package with KeyComboImpl and KeybindingImpl classes
- Move core keybindings and reserved key constants to package
- Update workbench layer to import from package with backward compatibility
- Update all imports across codebase to use package exports
- Maintain existing API surface for consumers
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