feat(chinese-chess): 实现中国象棋核心逻辑和基本功能

- 抽象出 ChessCore 类，包含游戏初始化、行棋逻辑、悔棋等功能
- 重构 Player 类，优化行棋和记录逻辑
- 更新 ChessBoard 和 ChessPiece 类，适应新逻辑
- 移除冗余代码，提高代码可读性和可维护性

Scripts/Entities/ChessBoard.cs

@@ -3,18 +3,13 @@ using System;
 using Godot;
 
 public partial class ChessBoard : Node2D {
-	public VirtualBoard board = null;
-	public Player playerSelf = null;
-
-	public delegate bool ChessMoveFunc(Vector2 toPos, Vector2 fromPos);
-	// public Callable chessMoveFunc { get; set; }
     public event EventHandler<Vector2> OnMouseClicked;
 	public event EventHandler<Vector2> OnPosClicked;
 
 	public override void _Ready() {
-		board = new VirtualBoard(9, 10);
-		playerSelf = new Player(board);
+	}
 
+	public void LoadBoard(VirtualBoard board) {
 		board.OnRemove += (sender, piece) => {
 			if (piece.data != null) {
 				RemoveChild(piece.data as Node);
@@ -22,32 +17,28 @@ public partial class ChessBoard : Node2D {
 		};
 
 		board.OnInsert += (sender, piece) => {
-			if (piece.data != null) {
+			if (piece.data != null && piece.data is Node) {
 				AddChild(piece.data as Node);
+			} else {
+				ChessPiece chessPiece = new(piece.name, piece);
+
+				if (piece.Pos().Y >= 5) {
+					chessPiece.LabelColor = new Color("red");
+				} else {
+					chessPiece.LabelColor = new Color("black");
+				}
+				AddChild(chessPiece);
 			}
 		};
-
-		// board.OnMove += (sender, args) => {
-		// 	// chessMoveFunc.Call(args.To, args.From);
-		// };
 	}
 	
 	public override void _Input(InputEvent @event) {
 		if (@event is InputEventMouseButton mouseEvent &&
-			mouseEvent.Pressed &&
-			mouseEvent.ButtonIndex == MouseButton.Left) {
-			// HandleMouseClick(GetGlobalTransformWithCanvas().AffineInverse() * mouseButton.Position);
-			
+				mouseEvent.Pressed &&
+				mouseEvent.ButtonIndex == MouseButton.Left) {
             OnMouseClicked?.Invoke(this, GetLocalMousePosition());
 			OnPosClicked?.Invoke(this, (PosTrans.transArrToPix.AffineInverse() *
 				GetLocalMousePosition()).Round());
 		}
 	}
-
-	public void InsertNode(ChessPiece node, Vector2 arrayPos) {
-		AddChild(node);
-		VirtualPiece piece = node.GetVirtualPiece();
-		// piece.Move(vector);
-		board.SetPiecePos(piece, arrayPos);
-	}
 }