Can I vibecode Yado?

Build me a phone-reachable Claude Code setup to replace Yado. Requirements:

- Runs on one always-on Ubuntu box I already own, a $5 VPS is fine. I reach it
  from Safari on my phone, there is nothing to install on the phone.
- Install Claude Code on the box and log it in by hand once over SSH, so the
  credentials sit on disk and nothing has to handle auth later. This step needs
  a laptop, say so in the README.
- Serve the terminal with ttyd running `tmux new -A -s claude`, so the session
  survives a dropped connection and keeps working while my phone is locked.
- Put Caddy in front for automatic HTTPS on a subdomain, with basic auth
  credentials read from .env. If I already run Tailscale, bind ttyd to the
  tailnet address instead and skip Caddy. No accounts, no telemetry, everything
  stays on my box.
- Make it usable with a thumb: start ttyd with `-t fontSize=18`, and write a
  ~/.tmux.conf with mouse mode on so I can scroll and switch panes by tapping.
- Add a Claude Code Stop hook in ~/.claude/settings.json that curls a private
  ntfy.sh topic, so my phone buzzes when a turn finishes instead of me sitting
  there watching output.
- A `work <repo>` shell function that attaches to the tmux session, cds into
  ~/code/<repo> and starts claude there. Repos live in ~/code, there is no
  database and nothing to migrate.
- Out of scope: multiple users and isolation between projects. Do not build a
  chat UI over `claude -p`, that is a far bigger project than this one.
- README: the one time SSH login, the DNS record for the subdomain, the ntfy
  topic name, and an honest warning that if the box goes down there is no way
  back in from the phone.