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>

lib/THIRD-PARTY.txt

@@ -5,10 +5,6 @@ Third-party libraries shipped with MSCO
   https://github.com/pardeike/Harmony - MIT License
   Copyright (c) 2017 Andreas Pardeike
 
-Newtonsoft.Json.dll - Json.NET 13.0.4 by James Newton-King
-  https://www.newtonsoft.com/json - MIT License
-  Copyright (c) 2007 James Newton-King
-
 MIT License: Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 associated documentation files (the "Software"), to deal in the Software without restriction, including without
 limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,