feat(grpc-proxy): expose GET /info endpoint

[priyaselvaganesan]

TL;DR

Adds GET /info to the grpc-proxy management HTTP server (port 10081, alongside /health), serving service name, version, and commit SHA via go-lib's shared nvcfversion.Handler().

Additional Details

• Fields come from Service/Version/GitHash x_defs injected at build time (--stamp); GitHash uses {STABLE_GIT_COMMIT_FULL} so commit is the full 40-char SHA. The three go-lib x_defs are added to the existing nvcf-grpc-proxy_lib map (the existing proxy.version x_def is kept).
• Extracts the mux construction into newProxyMux so the routes are unit-testable. / and /health behavior is unchanged.
• net/http ServeMux passes all methods to the handler, which returns 405 (Allow: GET) on non-GET.
• go-lib is a new dependency here, so MODULE.bazel gains the use_repo entry plus the gazelle_override used by other go-lib consumers.

Changes: proxy/h2.go, proxy/info_test.go, proxy/BUILD.bazel, BUILD.bazel (x_defs), tools/workspace_status.sh, MODULE.bazel, go.mod/go.sum.

For QA

Built with bazel build //:image.tar --stamp; confirmed the binary embeds nvcf-grpc-proxy and the full commit SHA. Endpoint behavior is covered by unit tests (GET -> 200 JSON; non-GET -> 405 + Allow: GET + empty body).

For the Reviewer

• go-lib PR: feat(go-lib/version): add Handler and HandlerFor http.Handler #270 (merged, provides nvcfversion.Handler())
• Reference: helm-reval feat(helm-reval): expose GET /info endpoint #275 (same pattern), ratelimiter feat(ratelimiter): expose GET /info endpoint #591 (sibling)
• POR: https://docs.google.com/document/d/1XigTpFIMVfkR-RgwdF7urquq8YxGYDEVamsrJNJwC-U

Issues

Relates to #315

Checklist

• I am familiar with the Contributing Guidelines.
• I have signed off my commits for Developer Certificate of Origin (DCO) compliance.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

Dependencies

Pins go-lib to the merged v0.0.0-20260728185909-afca4ec2fb26. Per Go MVS this pulls go.opentelemetry.io/otel to v1.44 and related golang.org/x deps forward, as go-lib requires.

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