[refactor] Extract keybinding functionality into @comfyorg/keybinding package

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

browser_tests/tests/dialog.spec.ts

@@ -1,7 +1,7 @@
+import type { Keybinding } from '@comfyorg/keybinding'
 import type { Locator } from '@playwright/test'
 import { expect } from '@playwright/test'
 
-import type { Keybinding } from '../../src/schemas/keyBindingSchema'
 import { comfyPageFixture as test } from '../fixtures/ComfyPage'
 
 test.beforeEach(async ({ comfyPage }) => {