Admin WORLD tab: reset world, backup now, list and restore save backups

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

MultiplayerManager.cs

@@ -422,6 +422,18 @@ namespace MSCO
             return true;
         }
 
+        /// <summary>Admin (nur dedizierter Server): Welt zurücksetzen (5), Backup anlegen (6), Backup wiederherstellen (7).</summary>
+        public void WorldAction(byte action, string backup)
+        {
+            if (session == null || !dedicated) return;
+            session.SendTo(NetSession.HostId, MsgType.AdminAction, NetSession.Build(w =>
+            {
+                w.Write(action);
+                w.Write(-1);
+                w.Write(backup ?? "");
+            }));
+        }
+
         /// <summary>Admin: Bann aufheben (Server: SteamID oder name:..., P2P: Name).</summary>
         public void Unban(string id)
         {
@@ -1268,6 +1280,13 @@ namespace MSCO
                         for (int i = 0; i < bans; i++) banned.Add(r.ReadString());
                     }
                     overlays.SetBanned(banned);
+                    var backups = new List<string>();
+                    if (r.BaseStream.Length - r.BaseStream.Position >= 4)
+                    {
+                        int n = r.ReadInt32();
+                        for (int i = 0; i < n; i++) backups.Add(r.ReadString());
+                    }
+                    overlays.SetBackups(backups);
                     break;
                 }