Importing a backup wrote every file from the zip over the target home
wholesale. On a hosted instance this clobbered gateway_state.json with the
source machine's last recorded run/desired state — driving the container-boot
reconciler (container_boot._read_desired_state, which only auto-starts a
gateway whose state is "running") off stale/foreign state and leaving the
gateway stuck "starting", disconnected from the Nous portal.
Add _IMPORT_SKIP_NAMES (gateway_state.json, gateway.pid, cron.pid,
gateway.lock, processes.json) and skip them by basename in run_import, so both
the root profile and named profiles preserve the target's own runtime state.
This mirrors what container_boot._STALE_RUNTIME_FILES already sweeps on every
container boot, and protects against older backups that predate the
backup-side exclusions. The import summary reports which files were preserved.
This is the second half of NS-501 (filed separately as NS-508): the upload
502 was fixed in #47663; this fixes the import-breaks-the-instance half.
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