feat: 重构棋盘逻辑和游戏流程,将引擎版本提升至4.3

- 重构了 VirtualBoard 类，优化了棋盘操作和事件处理
- 重写了 ChessPiece 类，增加了事件处理和虚拟棋子逻辑
- 更新了 ChessGame 控制器，增加了结束回合功能和对话框
- 调整了场景布局和资源引用
- 清理了冗余代码和注释

Scenes/ChessGame.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=3 format=3 uid="uid://g40y10iaf7qb"]
+[gd_scene load_steps=4 format=3 uid="uid://g40y10iaf7qb"]
 
 [ext_resource type="Script" path="res://Scripts/Controllers/ChessGame.cs" id="1_3x8ac"]
 [ext_resource type="PackedScene" uid="uid://b1tx7v3230wab" path="res://Scenes/Entities/Chessboard.tscn" id="1_yheur"]
+[ext_resource type="Theme" uid="uid://intlbeu8h82r" path="res://Asserts/defaultTheme.tres" id="3_rcfhx"]
 
 [node name="ChessGame" type="Node2D"]
 script = ExtResource("1_3x8ac")
@@ -10,29 +11,47 @@ script = ExtResource("1_3x8ac")
 position = Vector2(360, 660)
 scale = Vector2(2.5, 2.5)
 
-[node name="Undo" type="Button" parent="."]
-offset_left = 200.0
-offset_top = 50.0
-offset_right = 300.0
-offset_bottom = 150.0
-theme_override_font_sizes/font_size = 32
-text = "撤回"
+[node name="Control" type="Control" parent="."]
+layout_mode = 3
+anchors_preset = 0
+offset_right = 40.0
+offset_bottom = 40.0
+theme = ExtResource("3_rcfhx")
 
-[node name="ReInit" type="Button" parent="."]
-offset_left = 450.0
-offset_top = 50.0
-offset_right = 550.0
-offset_bottom = 150.0
-theme_override_font_sizes/font_size = 32
-text = "重开"
+[node name="Over" type="Button" parent="Control"]
+layout_mode = 0
+offset_left = 270.0
+offset_top = 1105.0
+offset_right = 449.0
+offset_bottom = 1209.0
+text = "结束回合
+(提示对方结束)"
 
-[node name="Home" type="Button" parent="."]
-offset_left = 310.0
-offset_top = 1108.0
-offset_right = 412.0
-offset_bottom = 1226.0
+[node name="Home" type="Button" parent="Control"]
+layout_mode = 0
+offset_left = 55.0
+offset_top = 56.0
+offset_right = 157.0
+offset_bottom = 164.0
 text = "返回主页"
 
-[connection signal="pressed" from="Undo" to="." method="Undo"]
-[connection signal="pressed" from="ReInit" to="." method="ReInit"]
-[connection signal="pressed" from="Home" to="." method="GoHome"]
+[node name="Undo" type="Button" parent="Control"]
+layout_mode = 0
+offset_left = 319.0
+offset_top = 58.0
+offset_right = 419.0
+offset_bottom = 158.0
+text = "撤回"
+
+[node name="ReInit" type="Button" parent="Control"]
+layout_mode = 0
+offset_left = 578.0
+offset_top = 55.0
+offset_right = 678.0
+offset_bottom = 155.0
+text = "重开"
+
+[connection signal="pressed" from="Control/Over" to="." method="BtnOver"]
+[connection signal="pressed" from="Control/Home" to="." method="GoHome"]
+[connection signal="pressed" from="Control/Undo" to="." method="Undo"]
+[connection signal="pressed" from="Control/ReInit" to="." method="ReInit"]