Path separator still not unified

On windows, when I use alias, have to write like this `{'\\public\\' : '\\public\\index.html'}`
and the console shows, aliasing \public\index.html as \public\

Hope can define like this `{'/public/' : '/public/index.html'}` on all platforms

Start by tracing how alias paths are handled in the static-cache middleware, focusing on path-separator conversion on Windows. Reproduce the shown alias configuration and verify that slash-style aliases produce the same mapping and console output across platforms.

Written by the indexing model from the issue text.