MSCO 2.9.0: standalone without MSCLoader (Unity Doorstop)

- Bootstrap: Doorstop entry point, loads Harmony/Newtonsoft from the MSCO folder, hooks
  PlayMakerArrayListProxy.Awake and starts MSCO in the main menu; skips the news screen
- No MSCLoader reference anymore; key bindings in PlayerPrefs, bind console command
- Harmony 1.2 and Newtonsoft.Json in lib/ (MIT notices); build copies to <game>\MSCO
- README/CHANGELOG updated

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

Branding.cs

@@ -6,7 +6,7 @@ namespace MSCO
 {
     /// <summary>
     /// MSCO-Logo (branding/logo-128.png, als Ressource in die DLL eingebettet):
-    /// Symbol in der MSCLoader-Modliste und im Launcher.
+    /// Symbol im MSCO-Launcher (Hauptmenü) und in Overlays.
     /// </summary>
     public static class Branding
     {