补全 UI 设计

- `ItemDescForm` 道具详细信息面板，目前还未添加 DescText 内容的赋值
- `RepoForm` 道具入槽逻辑调整，为了适应 `ItemDescForm` 的点击打开逻辑，点击道具自动匹配槽位改成拖动道具到相应槽位
- 添加了一系列图片素材

Assets/GameMain/Scripts/UI/General/RawData/ItemDescFormRawData.cs

@@ -0,0 +1,15 @@
+using GeometryTD.Definition;
+using UnityEngine;
+
+namespace GeometryTD.UI
+{
+    public class ItemDescFormRawData
+    {
+        public string Title;
+        public string TypeText;
+        public string Description;
+        public int Price;
+        public Vector3 TargetPos;
+        public TagType[] Tags;
+    }
+}

Assets/GameMain/Scripts/UI/General/RawData/ItemDescFormRawData.cs.meta

@@ -0,0 +1,11 @@
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+MonoImporter:
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+  serializedVersion: 2
+  defaultReferences: []
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+  icon: {instanceID: 0}
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