Fix deprecated legacy API imports with modern API shims

[TokenSpender]

ComfyUI has deprecated direct imports of several legacy API paths and logs
DEPRECATION WARNING in the browser console when these are imported directly
by extensions.

This replaces static imports with shims that check for the new
window.comfyAPI API first, falling back to the legacy path for backward
compatibility with older ComfyUI versions.

Files changed:

• comfyui-manager.js: ui.js, button.js + buttonGroup.js shims. Also
  replaces repeated inline await import() calls with top-level hoisted
  variables for ComfyButton and ComfyButtonGroup.
• components-manager.js: groupNode.js + ui.js shims
• comfyui-gui-builder.js: ui.js shim
• comfyui-share-common.js: ui.js shim
• comfyui-share-copus.js: ui.js shim
• comfyui-share-openart.js: ui.js shim
• comfyui-share-youml.js: ui.js shim
• common.js: ui.js shim
• custom-nodes-manager.js: ui.js shim
• model-manager.js: ui.js shim
• snapshot.js: ui.js shim

All static imports have been moved above shim blocks to maintain valid
JavaScript module syntax.

Addresses multiple open issues reporting DEPRECATION WARNING in the browser console.