feat(adapters): add GoFr support

[stareezy-1]

Summary

• add a humagofr adapter that registers Huma operations through GoFr's public routing API
• preserve Huma status codes, headers, response bodies, native GoFr context access, and ServeHTTP support
• add focused integration/context tests, the shared adapter test case, and BYOR documentation

GoFr keeps its HTTP router and response writer private. The adapter therefore captures the raw exchange in middleware, lets Huma write the response, then suppresses GoFr's second response envelope. A mirrored http.ServeMux provides the same Huma operation handlers to humatest and autopatch through Adapter.ServeHTTP.

GoFr currently exposes registration methods for GET, PUT, POST, DELETE, and PATCH only. The dependency is pinned to v1.55.0, the newest release compatible with Huma's Go 1.25 baseline.

Verification

• go test -race ./...
• golangci-lint run ./...
• GOTOOLCHAIN=go1.25.7 go test ./adapters/humagofr ./adapters

Fixes #1056

[stareezy-1]

Hi @wolveix — thanks again for welcoming a GoFr adapter contribution on #1056. The implementation and focused coverage are ready here; when you have time, I’d appreciate your review, especially of the middleware bridge used to preserve Huma’s raw response semantics with GoFr. Thanks!