feat: net10.0 Linux Console mode — zero Mono, 0 compile errors

Migrated from net48 (.NET Framework) to net10.0 (cross-platform):
- All 14 csproj: net48 → net10.0, WindowsDesktop SDK → Microsoft.NET.Sdk
- Excluded WinForms files (Form/**, DebugControl, GameControl, etc.)
- Excluded DB modules (GameDAL db/Sql/**, MrWu DB files)
- Excluded server runtime files (GameBase, GlobalSever managers, GameNetModule stubs)
- Added minimal stubs (GameDoStub.cs, NamespaceStubs.cs, ServerCoreStubs.cs)
- Created hjha-console entry project
- Fixed hardcoded Windows path → ./test/ directory
- Updated global.json to SDK 10.0.109

Console test mode: PdkGameMain(null).Test() → 发牌→包庄→打牌→结算
Verified: dotnet build 0 errors, dotnet run outputs game state machine

hjha-console/Program.cs

@@ -0,0 +1,19 @@
+using PdkFriendServer.Logic;
+using System;
+
+namespace hjha_console
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("=== HJHA Console Mode - 跑得快测试 ===");
+            Console.WriteLine("启动游戏状态机：发牌 → 包庄 → 打牌 → 结算");
+            Console.WriteLine();
+
+            string jsonPath = args.Length > 0 ? args[0] : null;
+            var main = new PdkGameMain(null);
+            main.Test(jsonPath ?? "");
+        }
+    }
+}