Panel: warn before changing the game/panel port (needs a full program restart, Docker port mapping, how to undo) so nobody locks themselves out

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

ConfigEditor.cs

@@ -24,7 +24,9 @@ public static class ConfigEditor
         panelBasePath = config.PanelBasePath,
         licenseKeySet = !string.IsNullOrWhiteSpace(config.LicenseKey),
         steamWebApiKeySet = !string.IsNullOrWhiteSpace(config.SteamWebApiKey),
-        environmentOverrides = config.EnvironmentOverrides
+        environmentOverrides = config.EnvironmentOverrides,
+        // In Docker muss ein anderer Port zusätzlich in docker-compose.yml freigegeben werden (Warnung im Panel)
+        inDocker = Environment.GetEnvironmentVariable("DOTNET_RUNNING_IN_CONTAINER") == "true"
     };
 
     /// <summary>Einstellungen ändern. Schlüssel (Lizenz, Steam Web API) nur als Owner; leer = unverändert.</summary>
@@ -69,6 +71,7 @@ public static class ConfigEditor
         config.AutosaveSeconds = Number("autosaveSeconds", config.AutosaveSeconds, 10, 3600);
 
         int before = changed.Count;
+        int oldPort = config.Port, oldPanelPort = config.PanelPort;
         config.Port = Number("port", config.Port, 1, 65535);
         config.PanelEnabled = Flag("panelEnabled", config.PanelEnabled);
         config.PanelPort = Number("panelPort", config.PanelPort, 0, 65535);
@@ -76,6 +79,8 @@ public static class ConfigEditor
         config.PanelTrustProxy = Flag("panelTrustProxy", config.PanelTrustProxy);
         config.PanelBasePath = Text("panelBasePath", config.PanelBasePath, 60);
         if (changed.Count > before) restartNeeded = true;
+        // Ports gehören dem Programm, nicht dem Gameserver: "Restart" im Panel reicht dafür nicht
+        bool portChanged = config.Port != oldPort || config.PanelPort != oldPanelPort;
 
         foreach (string secret in new[] { "licenseKey", "steamWebApiKey" })
         {
@@ -93,7 +98,9 @@ public static class ConfigEditor
         catch (Exception e) { return "Could not save server.json: " + e.Message; }
         GameServer.Log($"Settings changed by {by}: {string.Join(", ", changed)}");
         var overridden = changed.Where(c => config.EnvironmentOverrides.Any(e => e.Replace("_", "").Contains(c.ToUpperInvariant().Replace("ISPUBLIC", "PUBLIC")))).ToList();
-        return "Settings saved" + (restartNeeded ? " - some changes need a restart" : "") +
+        return "Settings saved" +
+               (portChanged ? " - the new port only applies after the whole program restarts (docker compose restart); in Docker publish it in docker-compose.yml first"
+                : restartNeeded ? " - some changes need a restart" : "") +
                (overridden.Count > 0 ? " (note: " + string.Join(", ", overridden) + " is also set by an environment variable, which wins on restart)" : "");
     }
 }