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/extensions/core/electronAdapter.ts

@@ -6,8 +6,8 @@ import { useToastStore } from '@/platform/updates/common/toastStore'
 import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { app } from '@/scripts/app'
 import { useDialogService } from '@/services/dialogService'
+import { checkMirrorReachable } from '@/utils/electronMirrorCheck'
 import { electronAPI as getElectronAPI, isElectron } from '@/utils/envUtil'
-import { checkMirrorReachable } from '@/utils/networkUtil'
 
 // Desktop documentation URLs
 const DESKTOP_DOCS = {