Own server tags in the web panel (Settings) and server.json

Tags (max. 6, normalized like the keymaster) are sent with the heartbeat;
official and featured are only given by the MSCO admins and are refused with
a note. MSCO_TAGS environment variable.

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

ConfigEditor.cs

@@ -10,6 +10,7 @@ public static class ConfigEditor
     {
         name = config.Name,
         description = config.Description,
+        tags = string.Join(", ", config.Tags ?? new()),
         maxPlayers = config.MaxPlayers,
         isPublic = config.Public,
         requireSteam = config.RequireSteam,
@@ -63,6 +64,13 @@ public static class ConfigEditor
         if (name.Length == 0) return "The server name cannot be empty";
         config.Name = name;
         config.Description = Text("description", config.Description, 300);
+        string tagNote = "";
+        if (b.TryGetProperty("tags", out var tagValue) && tagValue.ValueKind == System.Text.Json.JsonValueKind.String)
+        {
+            var tags = ServerConfig.NormalizeTags(tagValue.GetString().Split(','), out var reserved);
+            if (!tags.SequenceEqual(config.Tags ?? new())) { config.Tags = tags; changed.Add("tags"); }
+            if (reserved.Count > 0) tagNote = $" - the tag {string.Join(", ", reserved)} is only given by the MSCO admins";
+        }
         config.MaxPlayers = Number("maxPlayers", config.MaxPlayers, 1, 64);
         config.Public = Flag("isPublic", config.Public);
         config.RequireSteam = Flag("requireSteam", config.RequireSteam);
@@ -93,7 +101,7 @@ public static class ConfigEditor
             restartNeeded = true;
         }
 
-        if (changed.Count == 0) return "Nothing changed";
+        if (changed.Count == 0) return "Nothing changed" + tagNote;
         try { config.Save(configPath); }
         catch (Exception e) { return "Could not save server.json: " + e.Message; }
         GameServer.Log($"Settings changed by {by}: {string.Join(", ", changed)}");
@@ -101,6 +109,7 @@ public static class ConfigEditor
         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)" : "");
+               (overridden.Count > 0 ? " (note: " + string.Join(", ", overridden) + " is also set by an environment variable, which wins on restart)" : "") +
+               tagNote;
     }
 }