feat: 初始化 UI 框架和资源设计文档

- 新增 TopBarHUD 场景
- 新增开始菜单场景
- 新增通用资源分析设计文档

src/UI/HUD/TopBarHUD.tscn

@@ -0,0 +1,13 @@
+[gd_scene format=3 uid="uid://dl0tb68vsw3c6"]
+
+[node name="TopBarHud" type="Control" unique_id=1115394694]
+layout_mode = 3
+anchors_preset = 0
+
+[node name="HBoxContainer" type="HBoxContainer" parent="." unique_id=1608257100]
+layout_mode = 0
+offset_right = 40.0
+offset_bottom = 40.0
+
+[node name="Currency" type="Label" parent="HBoxContainer" unique_id=766096596]
+layout_mode = 2

src/UI/Panels/StartMenu.tscn

@@ -0,0 +1,16 @@
+[gd_scene format=3 uid="uid://bkatopgh40fte"]
+
+[ext_resource type="PackedScene" uid="uid://dl0tb68vsw3c6" path="res://src/UI/HUD/TopBarHUD.tscn" id="1_jy7gm"]
+
+[node name="StartMenu" type="Control" unique_id=1272477823]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="TopBarHud" parent="." unique_id=1115394694 instance=ExtResource("1_jy7gm")]
+custom_minimum_size = Vector2(100, 100)
+custom_maximum_size = Vector2(100, 100)
+layout_mode = 0