feat(chess): 初始化棋盘和玩家颜色,优化代码结构,重构多人游戏代码

- 在 ChessGame 中初始化棋盘，根据玩家颜色设置棋子
- 更新 UI 显示玩家颜色
- 调整棋盘位置和 UI 布局
- 重构部分代码以提高可读性和维护性

Scripts/Controllers/GameLobby.cs

@@ -10,6 +10,7 @@ public partial class GameLobby : Control {
 
     string URL;
     string userName;
+	bool isAcceptedPart = false;
 
 	// Called when the node enters the scene tree for the first time.
 	public override void _Ready() {
@@ -26,8 +27,11 @@ public partial class GameLobby : Control {
 			global.RPClient.SessionAckCreate(dialog.GetMeta("sessionId").ToString(), false);
 		};
 		dialog.Confirmed += () => {
-			if (dialog.Title == "Session Created")
-			global.RPClient.SessionAckCreate(dialog.GetMeta("sessionId").ToString(), true);
+			if (dialog.Title == "Session Created") {
+				// FIXME
+				isAcceptedPart = true;
+				global.RPClient.SessionAckCreate(dialog.GetMeta("sessionId").ToString(), true);
+			}
 		};
 
         global.RPClient.OnOpen += (string eventName, object[] args) => {
@@ -56,7 +60,14 @@ public partial class GameLobby : Control {
 				dialog.Visible = true;
 			} else {
 				if (res) {
+					// TODO FIXME
 					global.sessionId = sessionId;
+					if (!isAcceptedPart) {
+						global.GlobalData["player_color"] = "red";
+					} else {
+						global.GlobalData["player_color"] = "black";
+					}
+					// GD.PrintErr("sessionId: ", reqUserId, "color: ", global.GlobalData["player_color"].AsString());
 					global.GotoScene("res://Scenes/ChessGame.tscn");
 				} else {
 					dialog.Title = "Failed";