Extract shared utilities into workspace package (#5843)

## Summary

Extracts shared formatting and network utilities into dedicated
workspace package.

## Changes

- **What**: Created `@comfyorg/shared-frontend-utils` package containing
formatUtil and networkUtil
- **Breaking**: None - utilities remain accessible via path aliases in
`tsconfig`

Split `createAnnotatedPath` and `electronMirrorCheck` out and left in
frontend, due to their tightly-coupled nature. See [discussion on this
PR](https://github.com/Comfy-Org/ComfyUI_frontend/pull/5843#issuecomment-3344724727).

src/renderer/extensions/vueNodes/widgets/composables/useImageUploadWidget.ts

@@ -9,7 +9,7 @@ import type { InputSpec } from '@/schemas/nodeDefSchema'
 import type { ComfyWidgetConstructor } from '@/scripts/widgets'
 import { useNodeOutputStore } from '@/stores/imagePreviewStore'
 import { isImageUploadInput } from '@/types/nodeDefAugmentation'
-import { createAnnotatedPath } from '@/utils/formatUtil'
+import { createAnnotatedPath } from '@/utils/createAnnotatedPath'
 import { addToComboValues } from '@/utils/litegraphUtil'
 
 const ACCEPTED_IMAGE_TYPES = 'image/png,image/jpeg,image/webp'