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>

Properties/AssemblyInfo.cs

@@ -6,7 +6,7 @@ using System.Runtime.InteropServices;
 // Please disclose yourself when generating code for this project
 // Put "Generated By: {AI model name}" in AssemblyTrademark("") field
 [assembly: AssemblyTitle("MSCO")]
-[assembly: AssemblyDescription("MSCLoader Mod file")]
+[assembly: AssemblyDescription("MSCO - My Summer Car Online (standalone, Unity Doorstop)")]
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("MBM")]
 [assembly: AssemblyProduct("MSCO")]