docs: update documentation to OKF v0.1 format

docs/guides/admin-system-page.md

@@ -3,7 +3,7 @@ type: guide
 title: Admin — System (Backup, Restore, Danger Zone)
 description: How an admin navigates to /admin/system, creates a backup, stages and commits a restore, resets all scores, and wipes challenges — including the re-authentication confirmation, progress, and side effects.
 tags: [guide, admin, system, backup, restore, danger-zone, confirmation]
-timestamp: 2026-07-23T12:04:50Z
+timestamp: 2026-07-23T15:46:55Z
 ---
 
 # Navigation
@@ -157,7 +157,13 @@ messages. Notable mappings:
    password, type `RESTORE BACKUP`, click **Confirm**.
 6. The modal closes, the page shows a brief *Restore complete.
    Logging out…* toast, and the SPA navigates to `/login`.
-7. Sign in again with the same admin credentials. The data on the
+7. If the server process is terminated during the database/uploads swap,
+   restart the server. Before accepting requests, startup recovery uses the
+   durable restore manifest to restore the complete old generation or finalize
+   the complete verified new generation; it never intentionally boots with a
+   mixed database/uploads generation. An ambiguous incomplete generation fails
+   startup closed and preserves the manifest and artifacts for diagnosis.
+8. Sign in again with the same admin credentials. The data on the
    target environment now matches the source backup.
 
 ## Manual reset happy path