proxyhub — all-in-one entrypoint

  docker : /v2/<registry>/<repo>   (public: elastic, gcr, ghcr, hub, k8s, k8s-gcr, mcr, nvcr, ollama, quay)
           /v2/r/<registry-host>/<repo>  (any OCI registry; docker login <host> for private)
  others : /<service>/<path>       (apk, apt, cache, conda, crates, github, gmaven, goproxy, gradle, hf, maven, npm, pypi, torch)