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/Src/ChineseChess/Player.cs

@@ -5,9 +5,9 @@ using System.Collections;
 public class Player {
 	private readonly VirtualBoard board;
 	private readonly SelectedPiece selectedNode;
-	private readonly MoveRecords<VirtualPiece> moveRecords;
-	public EventHandler<VirtualBoard.MoveEventArgs> OnMove;
 	
+	public EventHandler<VirtualBoard.MoveEventArgs> OnMove;
+	public bool CanMove { get; set; } = true;
 
 	public enum PlayerType {
 		Human,
@@ -18,15 +18,6 @@ public class Player {
 	{
 		this.board = board;
 		this.selectedNode = new SelectedPiece(board);
-		this.moveRecords = new MoveRecords<VirtualPiece>(onUndoRecordCallback: (newNode, oldNode, newPos, oldPos) => {
-			// GD.Print("Undo: ", newNode, "->", oldNode, ":", newPos, "->", oldPos);
-			VirtualPiece newPiece = newNode;
-			VirtualPiece oldPiece = oldNode;
-			this.board.MovePiece(newPos, oldPos);
-			if (newPiece != null) {
-				this.board.InsertPiece(newPiece, newPos);
-			}
-		});
 	}
 
 	public void HandleBoardPosClick(Vector2 clickPos) {
@@ -47,7 +38,7 @@ public class Player {
 		} else {
 			// Move piece
 			// GD.Print("default MoveFunc Move: ", selectedNode.GetPos(), "->", clickPos);
-			MoveAndRecord(clickPos, selectedNode.GetPos());
+			if (CanMove) MoveAndRecord(clickPos, selectedNode.GetPos());
 		}
 	}
 
@@ -56,6 +47,9 @@ public class Player {
 		VirtualPiece toChess = board.GetPiece(toPos);
         VirtualPiece fromChess = board.GetPiece(fromPos);
 		fromChess?.Selected(false);
+		
+		// MUST BE THERE !!! 防止删除节点后在启动回调导致错误
+		OnMove?.Invoke(this, new VirtualBoard.MoveEventArgs { From = fromPos, To = toPos });
 
 		VirtualPiece NowNode;
         if (toChess != null) {
@@ -64,26 +58,13 @@ public class Player {
         } else {
 			NowNode = toChess;
 		}
-		moveRecords.AddRecord(NowNode, fromChess, toPos, fromPos);
-
-		OnMove?.Invoke(this, new VirtualBoard.MoveEventArgs { From = fromPos, To = toPos });
         board.MovePiece(fromPos, toPos);
 
 		selectedNode.Clear();
 	}
 
-	public void Undo() {
-		// ChessPiece selected = selectedNode.GetPiece();
-		// selected?.DeSelected();
+	public void SelectedClear() {
 		selectedNode.Clear();
-		moveRecords.Undo();
-	}
-
-	public void ReInit() {
-		moveRecords.Clear();
-		board.Clear();
-		selectedNode.Clear();
-		// board.InitChessBoard();
 	}
 
 	public void SetAllowedPieces(ArrayList allowedPieces) {