test(distributed): make the cluster harness survive a restart

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Restarting a frontend replica must not move it: workers read
LOCALAI_REGISTER_TO once at boot and never re-resolve it, so a replica that
returns on a fresh port is unreachable by the workers that registered with it.
startFrontend now takes the port, with <= 0 meaning "allocate".

Process logs are opened for append rather than truncated, so a restarted
process cannot erase the log of the instance that died, which is the log a
failover post-mortem needs. The post-SIGKILL wait is bounded, so one stuck
child no longer becomes a suite-wide timeout that names nothing. Stop is
nil-safe because Start returns a nil cluster after stopping itself.

Start's doc comment no longer claims to wait for worker registration; that
needs an authenticated admin session, so it now says callers must poll
/api/nodes themselves.

Assisted-by: Claude Opus 5 [claude-code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

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