Node.js: reads version from package.json, commit from .git-commit file
or git rev-parse --short HEAD at runtime, with unknown fallback.
Go: uses -ldflags build-time variables (Version, Commit) with fallback
to .git-commit file and git command at runtime.
Dockerfile: copies .git-commit if present (CI bakes it before build).
Dockerfile.go: passes APP_VERSION and GIT_COMMIT as build args to ldflags.
deploy.yml: writes GITHUB_SHA to .git-commit before docker build steps.
docker-compose.yml: passes build args to Go staging build.
Tests updated to verify version and commit fields in both endpoints.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>