Three more composes — compose.tailnet.yml, compose.tailnet.frontend.yml,
compose.tailnet.backend.yml — mirror the funnel set exactly but mount
serve.default/frontend/backend.tailnet.json, which drop AllowFunnel. The
sidecar still registers and serves HTTPS with a tailnet certificate, but
nothing is exposed publicly; Serve also needs no ACL change.
Project names carry a -tailnet suffix so both sets can coexist, and the
README explains that each set needs its own data directory (or host), plus
how to switch a host between funnel and tailnet by starting the other file
with the same .env.
Verified: all six composes validate with docker compose config, and the
six serve configs split cleanly into funnel (AllowFunnel present) and
tailnet-only (absent).
