…tups

In monorepo setups where node_modules are hoisted to a parent directory
above the Angular workspace root, assets loaded from those packages
(e.g., fonts from CSS files) were blocked by Vite's dev server with a
403 error.

This was caused by the explicit `server.fs.allow` configuration only
including the workspace root's `node_modules`, which overrides Vite's
default package root detection. By adding `searchForPackageRoot()` to
the allow list, the monorepo root directory is included, allowing access
to hoisted node_modules.

Fixes angular#31016