License: running server keeps running until the next restart

The configurable LicenseGraceHours setting is gone. If the master is down or
rejects the key, a running server now only warns and keeps running until the
next restart; a (re)start still works up to 72 h after the last confirmation.

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

ServerHost.cs

@@ -171,14 +171,6 @@ public sealed class ServerHost
             Server = null;
 
             if (server.ExitRequested) break;
-            if (server.LicenseStopReason != null)
-            {
-                // Lizenz zu lange nicht bestätigt: regelmäßig neu versuchen - startet von selbst, sobald der Master wieder bestätigt
-                SetState(HostState.Error, server.LicenseStopReason);
-                startRequested = true;
-                startAt = DateTime.UtcNow + LicenseRetryDelay;
-                continue;
-            }
             if (server.RestartRequested)
             {
                 GameServer.Log("Restarting the server ...");
@@ -269,14 +261,14 @@ public sealed class ServerHost
             else
             {
                 // Master nicht erreichbar oder lehnt ab: mit der letzten Bestätigung starten, solange sie frisch genug ist
-                var grace = TimeSpan.FromHours(Math.Clamp(Config.LicenseGraceHours, 1, 24 * 30));
+                var grace = LicenseCache.Grace;
                 var cached = LicenseCache.Load(dataDir, Config.LicenseKey);
                 string problem = key.Unreachable ? $"Master server not reachable ({key.Error})" : "License key rejected: " + (key.Error ?? "unknown key");
                 if (cached != null && DateTime.UtcNow - cached.LastConfirmedUtc < grace)
                 {
                     var left = grace - (DateTime.UtcNow - cached.LastConfirmedUtc);
                     GameServer.Log($"WARNING: {problem} - starting with the license confirmed {LicenseCache.Span(DateTime.UtcNow - cached.LastConfirmedUtc)} ago " +
-                                   $"(owner {cached.Owner}). The server keeps running for {LicenseCache.Span(left)} unless the master confirms it again.");
+                                   $"(owner {cached.Owner}). The server keeps running until the next restart; a restart works for {LicenseCache.Span(left)} more.");
                     owner = cached.Owner ?? "?";
                     confirmed = cached.LastConfirmedUtc;
                 }