Bootstrap initial NAS administrator on empty database

README.md

@@ -41,7 +41,10 @@ with new games; the requested host port is 33046.
 
 The **Administration** link opens `/admin`, with separate administrator sign-in,
 session controls and a searchable room directory. **Room controls** lets owners
-and operators pause/resume rooms and lock/unlock new joins. See [room controls](docs/ADMIN_ROOM_CONTROLS.md)
+and operators pause/resume rooms and lock/unlock new joins. The NAS container
+prints a newly generated initial owner access key in its log only if there are
+no administrator accounts. Save it privately: log readers can use it, and later
+starts do not print it again. See [room controls](docs/ADMIN_ROOM_CONTROLS.md)
 and [initial owner setup](docs/ADMIN_PANEL.md#initial-owner-and-access-recovery).
 Owners/operators can [create a configured lobby](docs/ADMIN_ROOM_CREATION.md) with
 an explicitly owned new host seat and initial AI players.