956133bf45
Node.js 22.21.0+ natively supports HTTP_PROXY, HTTPS_PROXY, and NO_PROXY environment variables via NODE_USE_ENV_PROXY, eliminating the need for undici and global-agent workarounds. This also works with node-fetch and cross-fetch since they delegate to node:http/node:https without overriding the HTTP agent. Add a new corporate proxy tutorial under docs/ with the recommended approach and update the legacy guide in contrib/ to point to it. Update proxy references in the deployment, keeping-backstage-updated, and TechDocs CLI docs to mention NODE_USE_ENV_PROXY. Signed-off-by: Jon Koops <jonkoops@gmail.com>