MSCO 2.9.1: fixes without MSCLoader, admin teleport, MSCO branding

- Own JSON reader (MiniJson) instead of Newtonsoft.Json - the server browser failed with
  "Could not load System.Runtime.Serialization" once MSCLoader was gone
- Mouse cursor visible in admin menu/chat/console (PlayerInMenu)
- Intro "Press any key" screen replaced by an MSCO loading screen; hook PlayMakerFSM.Awake too
- Join links while the game runs: picked up from MSCO\join.txt (written by the launcher)
- Admin menu: TELEPORT tab (home, shop, repair shop, inspection, villages, events, Satsuma)
- Window title/icon "MSCO - My Summer Car Online", MSCO logo in the main menu
- In-game UI restyled like the keymaster website (rounded cards, pills, glow, slim scrollbars)

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

MSCO.cs

@@ -11,7 +11,7 @@ namespace MSCO
         /// Version der Mod. Kleine Updates: nur die dritte Stelle erhöhen (2.9.1, 2.9.2 ...) - sie bleiben mit
         /// Servern und Mitspielern derselben ersten zwei Stellen kompatibel.
         /// </summary>
-        public const string ModVersion = "2.9.0";
+        public const string ModVersion = "2.9.1";
         /// <summary>
         /// Netzwerk-Version (die ersten beiden Stellen). Nur erhöhen, wenn sich das Protokoll inkompatibel ändert - dann
         /// auch GameServer.ModVersion im Server.