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).

pnpm-lock.yaml

@@ -373,6 +373,16 @@ importers:
 
   packages/registry-types: {}
 
+  packages/shared-frontend-utils:
+    dependencies:
+      axios:
+        specifier: ^1.11.0
+        version: 1.11.0
+    devDependencies:
+      typescript:
+        specifier: ^5.9.2
+        version: 5.9.2
+
   packages/tailwind-utils:
     dependencies:
       clsx: