host.conf.template: add AUTH STACK section (NPM/lldap/Authelia) so
conf_upgrade.sh stops stripping those keys from host*.conf at 1am.
setup wizard: storage mode selector auto-detects USB vs NVMe at first
run; user can override; triggers storage_migrate.sh when mode differs
from current SCRIPTS_DIR location.
claude_startup.sh: reads HOST*_STORAGE_MODE_INTERNAL to pick internal
or appdata path rather than always requiring array to be mounted.