chore(rename): railiance-bootstrap → railiance-cluster

Update all operational references to reflect the new repo name per
ADR-003 (OAS S2 Cluster Runtime). Historical text in docs preserved.
Gitea remote URL updated locally (Gitea repo rename is a manual step).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/backup-restore.md

@@ -79,7 +79,7 @@ reads this to verify freshness.
 **Automated:** a cron job runs the backup daily at 02:00:
 
 ```
-0 2 * * * /home/worsch/railiance-bootstrap/bin/railiance backup >> ~/.cache/railiance/backup.log 2>&1
+0 2 * * * /home/worsch/railiance-cluster/bin/railiance backup >> ~/.cache/railiance/backup.log 2>&1
 ```
 
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