feat: 实现存档界面与场景切换，优化文字渲染

- 新增 SavePanel/SaveSlot 存档选择界面，支持已有存档与新建存档
- 新增 GameState 单例与 MainGame 入口，按参数区分新游戏/读档
- 主菜单接入中文字体，返回/进入存档面板流程打通
- 开启 2D/3D MSAA、TAA 与屏幕空间 AA，消除放大文字锯齿
- 设置 1920x1080 视口与中文本地化过滤

src/UI/HUD/TopBarHUD.tscn

@@ -1,13 +1,120 @@
 [gd_scene format=3 uid="uid://dl0tb68vsw3c6"]
 
+[ext_resource type="FontFile" uid="uid://drt448qncx27p" path="res://assets/fonts/dingliezhuhaifont-20240831GengXinBan)-2.ttf" id="1_pa2rn"]
+[ext_resource type="Script" uid="uid://d3o1ssph7ca58" path="res://src/UI/HUD/top_bar_hud.gd" id="1_vm4eo"]
+
+[sub_resource type="LabelSettings" id="LabelSettings_bn2o5"]
+font = ExtResource("1_pa2rn")
+
 [node name="TopBarHud" type="Control" unique_id=1115394694]
 layout_mode = 3
-anchors_preset = 0
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_vm4eo")
 
 [node name="HBoxContainer" type="HBoxContainer" parent="." unique_id=1608257100]
-layout_mode = 0
-offset_right = 40.0
-offset_bottom = 40.0
+layout_mode = 1
+anchors_preset = 10
+anchor_right = 1.0
+offset_bottom = 23.0
+grow_horizontal = 2
 
-[node name="Currency" type="Label" parent="HBoxContainer" unique_id=766096596]
+[node name="Label_Currency" type="Label" parent="HBoxContainer" unique_id=766096596]
 layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+text = "灵石"
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="Value_Currency" type="Label" parent="HBoxContainer" unique_id=1150573727]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="Label_Time" type="Label" parent="HBoxContainer" unique_id=671872515]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+text = "时间"
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="Value_Time" type="Label" parent="HBoxContainer" unique_id=1229577188]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="Label_Reputation" type="Label" parent="HBoxContainer" unique_id=985110673]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+text = "声望"
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="Value_Reputation" type="Label" parent="HBoxContainer" unique_id=2011931119]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="placeholder_1" type="Label" parent="HBoxContainer" unique_id=1042446504]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="placeholder_2" type="Label" parent="HBoxContainer" unique_id=1526548351]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="placeholder_3" type="Label" parent="HBoxContainer" unique_id=1170426663]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="placeholder_4" type="Label" parent="HBoxContainer" unique_id=1878816574]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="placeholder_5" type="Label" parent="HBoxContainer" unique_id=491155620]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="placeholder_6" type="Label" parent="HBoxContainer" unique_id=1738250574]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 8
+label_settings = SubResource("LabelSettings_bn2o5")
+
+[node name="Button_StaffManagement" type="Button" parent="HBoxContainer" unique_id=568204305]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 4
+theme_override_fonts/font = ExtResource("1_pa2rn")
+text = "管理"
+
+[node name="Button_ResourcesManagement" type="Button" parent="HBoxContainer" unique_id=1424251140]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 4
+theme_override_fonts/font = ExtResource("1_pa2rn")
+text = "资源"
+
+[node name="Button_Return" type="Button" parent="HBoxContainer" unique_id=867839141]
+layout_mode = 2
+size_flags_horizontal = 3
+theme_override_fonts/font = ExtResource("1_pa2rn")
+text = "返回"
+
+[connection signal="button_up" from="HBoxContainer/Button_Return" to="." method="_on_button_return_button_up"]