引入 UISerializationRoot 和 Item

- 完成 MenuForm 和 SelectRoleForm 的迁移

Assets/GameMain/UI/UIForms/ShopForm.prefab

@@ -695,7 +695,7 @@ RectTransform:
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
   m_AnchorMin: {x: 0, y: 1}
   m_AnchorMax: {x: 1, y: 1}
-  m_AnchoredPosition: {x: 2, y: 0.000006247098}
+  m_AnchoredPosition: {x: 2, y: 0.000906718}
   m_SizeDelta: {x: -2, y: 300}
   m_Pivot: {x: 0, y: 1}
 --- !u!1 &3529895034686484875
@@ -1473,7 +1473,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   _titleText: {fileID: 3147210475793208583}
-  _countText: {fileID: 0}
+  _countText: {fileID: 8582964069843304838}
   _displayItemTemplate: {fileID: 8108003253794388876, guid: a76ff56683a2bc2479ebd63dcdd658b0,
     type: 3}
   _displayItemRoot: {fileID: 4930859207330783680}
@@ -1678,7 +1678,7 @@ MonoBehaviour:
   m_HandleRect: {fileID: 8982130026310361329}
   m_Direction: 2
   m_Value: 0
-  m_Size: 0.999986
+  m_Size: 0.96765774
   m_NumberOfSteps: 0
   m_OnValueChanged:
     m_PersistentCalls: