Keep the dev container as root for s6 init so composer can create
vendor/ on root-owned mounts, then chown writable paths to www-data.
Move init-setup into a shell script and expose VITE_HOST/PORT for
remote HMR (LAN/Tailscale) with Vite listening on 0.0.0.0.
Add scripts and Lima config for managing local coold endpoint VMs,
mint Flux dev host JWTs, expose coold host details on the V5 home
page, and document the local development workflow.
