[SSR][import.meta.glob] Resolve glob patterns starting with / to root

[brillout]

Is your feature request related to a problem? Please describe.

The glob patterns must be relative and start with ..

This makes sense in the context of building a custom SSR implementation: the code defining the glob pattern lives in the same file structure than the files being glob imported.

But this is not the case for SSR frameworks. The glob pattern is defined by the SSR framework, and the SSR framework code lives in antoher file structure than the user's app code.

Going from the SSR framework's file structure to the user's file structure using a relative path is brittle.

Describe the solution you'd like

Allow Glob patterns to start with /, which Vite then resolves relative to the root. For example import.meta.glob('/pages/*.vue') or import.meta.glob('/**/*.page.*').