New game from the panel instead of an uploaded save (2.9.3)

World & Backups -> Start new game (console: new-game, also when stopped):
the save is backed up and replaced by a new-game marker (also as reset
point). Joining players are told to start a new game; the server pulls the
first player's save and from then on runs normally. Reset world returns to
a new game when the reset point is one.

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

ServerHost.cs

@@ -306,7 +306,7 @@ public sealed class ServerHost
         if (!server.LoadSave())
             return Fail(SaveStore.HasSave(dataDir)
                 ? "The save game could not be loaded - see the console"
-                : "No save game yet - upload one as ZIP in the panel (World & Backups) or copy it to data/save");
+                : "No save game yet - upload one as ZIP in the panel (World & Backups), start a new game there or copy it to data/save");
         server.Panel = Panel;
         server.Host = this;
         server.LicenseConfirmedUtc = confirmed;
@@ -369,7 +369,8 @@ public sealed class ServerHost
         resetPoint = SaveStore.HasResetPoint(dataDir)
             ? File.GetLastWriteTimeUtc(Path.Combine(SaveStore.OriginalPath(dataDir), "defaultES2File.txt")).ToString("o") : null,
         saveSyncMinutes = Config.SaveSyncMinutes,
-        hasSave = SaveStore.HasSave(dataDir),
+        hasSave = SaveStore.HasSave(dataDir) || SaveStore.IsNewGame(dataDir),
+        newGame = SaveStore.IsNewGame(dataDir),
         hasLicenseKey = !string.IsNullOrWhiteSpace(Config.LicenseKey)
     };