Function rewrite_root_to_v2 

async fn rewrite_root_to_v2(req: Request, next: Next) -> Response

Middleware to rewrite root paths to /v2 paths

Requests to /rewards/... get rewritten to /v2/rewards/... Paths already prefixed with /v2 are left unchanged

Note: This middleware is only applied to the v2 router, so v1 routes never pass through it