Move VPN provisioning onto router model

src/main/java/com/litoralregas/vpnprovisioner/vps/WireGuardVpsService.java

@@ -79,4 +79,18 @@ public class WireGuardVpsService {
 
         return result.stdout();
     }
+
+    public String restoreLastWireGuardBackup() {
+        SshCommandResult result = sshService.executeOnConfiguredVps(
+                "sudo /usr/local/sbin/lr-wg-restore-last-backup"
+        );
+
+        if (result.exitCode() != 0) {
+            throw new SshCommandException(
+                    "Failed to restore WireGuard backup: " + result.stderr()
+            );
+        }
+
+        return result.stdout();
+    }
 }