fix: preserve URL params after middleware path rewrite - #3
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When middleware modifies r.URL.Path, update RoutePath so downstream handlers resolve URL parameters against the rewritten path. Closes madalynerlge2#1
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When middleware modifies r.URL.Path (for prefix stripping or path rewriting), chi caches RoutePath during initial routing. If RoutePath is not updated to match the new path, downstream handlers return empty strings from URLParam().
This fix updates RouteContext.RoutePath alongside r.URL.Path so URL parameters are resolved against the rewritten path. Closes #1.