feat(重构): 重构棋盘和棋子的逻辑

- 重构了 ChessBoard 和 ChessPiece 类的逻辑
- 添加了新版本的 ChineseChess 库
- 删除了旧版本的 VirtualBoard 和 VirtualPiece 类
- 更新了相关的场景和脚本

Scripts/Src/IPiece.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using Vector2I = Vector.Vector2I;
+
+public interface IPiece {
+    Vector2I Pos { get; set; }
+    string Name { get; set; }
+    bool IsSelected { get; set; }
+    Dictionary<string, object> Data { get; set; }
+
+    event EventHandler<Vector2I> OnPos;
+    event EventHandler<Vector2I> OnMove;
+    event EventHandler<bool> OnSelected;
+    event EventHandler<string> OnName;
+
+    bool CanMove(Vector2I to);
+    bool Move(Vector2I pos);
+}