feat: 重构多人游戏界面和代码,使用文件存储游戏配置,重构底层代码

Scripts/Entities/ChessPiece.cs

@@ -11,7 +11,7 @@ public partial class ChessPiece : Sprite2D {
     private Vector2 textureSize;
 
     private Label labelOfChessName;
-    private VirtualPiece piece;
+    private readonly VirtualPiece piece;
 
     public VirtualPiece GetVirtualPiece() {
         return piece;