Setup previously called runner.StartConnector (`cloudflared service install`)
while the TUI applyCloudflareEdge separately installs cloudflared-felis.service
for the same tunnel from the same config -- two managed services serving one
tunnel from one connector config.
Drop StartConnector from cfsetup: running a connector is a host-specific side
effect (systemd/launchd/Windows service) that belongs with the caller, not in
this host- and domain-agnostic package whose documented side effects are tunnel
creation, DNS routing, and the Access app/policy calls. installCloudflaredService
in the host layer stays the single connector installer, so the routed-but-dead
1033 is still closed; RouteDNS --overwrite-dns still closes the stale-DNS 1033.