fix(bridge): map.live names a player by userID, not UserIDString

The phase 14 walk read `steamId: null` for every sleeper made on the
server: UserIDString is a cached string the game fills for a player it has
seen connect. An id the map cannot name is an own dot and a clan mate the
site can never match, so the map reads the id from userID itself.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

overlay/oxide/plugins/RunicGateway.cs

@@ -9027,6 +9027,18 @@ namespace Oxide.Plugins
             CurrentPicture();
         }
 
+        /// <summary>
+        ///     A player's Steam id as text, from <c>userID</c> itself. <c>UserIDString</c> is a
+        ///     cached string the game fills for a player it has seen connect, and the phase 14 walk
+        ///     read it back empty from a sleeper made on the server: an id the map could not name
+        ///     is an own dot and a clan mate the site can never find.
+        /// </summary>
+        private static string SteamIdOf(BasePlayer p)
+        {
+            ulong id = p.userID;
+            return id.ToString(System.Globalization.CultureInfo.InvariantCulture);
+        }
+
         private static bool Gone(BaseEntity e)
         {
             return e == null || e.IsDestroyed || e.transform == null;
@@ -9133,7 +9145,7 @@ namespace Oxide.Plugins
                     continue;
 
                 Dictionary<string, object> row = At(p.transform.position);
-                row["steamId"] = p.UserIDString;
+                row["steamId"] = SteamIdOf(p);
                 row["name"] = p.displayName;
                 row["sleeping"] = p.IsSleeping();
                 row["online"] = true;
@@ -9156,7 +9168,7 @@ namespace Oxide.Plugins
                 }
 
                 Dictionary<string, object> row = At(p.transform.position);
-                row["steamId"] = p.UserIDString;
+                row["steamId"] = SteamIdOf(p);
                 row["name"] = p.displayName;
                 row["sleeping"] = true;
                 row["online"] = false;