feat(游戏结束): 添加死亡原因显示功能

- 新增JsonTool工具类用于解析JSON文件
- 在GameOver面板中添加死亡原因显示标签
- 添加死亡原因JSON数据文件
- 在GameRule中加载死亡原因数据

components/Scenes/FullscreenPanels/GameOver.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=7 format=3 uid="uid://beo6s1kudbbve"]
+[gd_scene load_steps=8 format=3 uid="uid://beo6s1kudbbve"]
 
 [ext_resource type="PackedScene" uid="uid://d3qojeqa3difn" path="res://components/Abstracts/FullscreenPanelBase.tscn" id="1_u2ynr"]
 [ext_resource type="Script" path="res://scripts/Contents/Panels/GameOver.gd" id="2_6cd45"]
@@ -12,11 +12,16 @@ bg_color = Color(1, 0, 0, 0.3)
 font = ExtResource("3_oynlg")
 font_size = 50
 
+[sub_resource type="LabelSettings" id="LabelSettings_ndokf"]
+font = ExtResource("3_oynlg")
+font_color = Color(0.710938, 0.710938, 0.710938, 1)
+
 [node name="GameOver" instance=ExtResource("1_u2ynr")]
-visible = false
+offset_top = 0.0
+offset_bottom = 0.0
 script = ExtResource("2_6cd45")
 
-[node name="wrapper" parent="content" index="0"]
+[node name="wrapper" parent="content" index="1"]
 theme_override_constants/separation = 50
 
 [node name="container" type="PanelContainer" parent="content/wrapper" index="0"]
@@ -24,12 +29,23 @@ layout_mode = 2
 size_flags_vertical = 3
 theme_override_styles/panel = SubResource("StyleBoxFlat_7gbuu")
 
-[node name="text" type="Label" parent="content/wrapper/container" index="0"]
+[node name="VBoxContainer" type="VBoxContainer" parent="content/wrapper/container" index="0"]
+layout_mode = 2
+alignment = 1
+
+[node name="text" type="Label" parent="content/wrapper/container/VBoxContainer" index="0"]
 layout_mode = 2
 size_flags_horizontal = 4
 text = "败北"
 label_settings = SubResource("LabelSettings_17i5j")
 
+[node name="deadreason" type="Label" parent="content/wrapper/container/VBoxContainer" index="1"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 4
+text = "死亡原因"
+label_settings = SubResource("LabelSettings_ndokf")
+
 [node name="audio" type="AudioStreamPlayer2D" parent="." index="2"]
 unique_name_in_owner = true
 stream = ExtResource("3_n4aax")