CodeSandbox

Build me a personal cloud dev environment to replace CodeSandbox. Requirements: - Do not write an IDE. Set up code-server (VS Code in the browser) on my VPS via its official install script, running under systemd, bound to localhost. - Access over Tailscale or an SSH tunnel only; no public exposure, built-in password auth switched off. That is the whole security model, keep it that simple. - A sandbox CLI: sandbox new <name> --template node|python|static copies a folder from templates/ into ~/sandboxes/<name>, runs its install step, and prints the code-server URL opened to it. - Three templates: node (Express hello world + nodemon), python (venv + Flask), static (index.html served with live-server). - Previews: each sandbox's dev server gets its own port, reachable through the same tunnel; a tiny index page lists sandboxes and their ports. - sandbox rm <name> archives the folder to a tarball before deleting it. - No accounts, no telemetry; everything lives on my own server. - Out of scope: multi-user collaboration, instant VM forking, and public preview URLs; managed infrastructure is the hosted product. - README: install steps, tunnel setup, and how to add a template.