接入菜单导航并改造通用按钮交互

- 将 CommonButton 改为基于 Unity Button 实现，保留原有 pointer enter、click、pointer exit 三类事件配置，同时接入 Selectable/Button 的导航、选中和提交能力。补充 CommonButton 自定义 Inspector，保留项目自定义事件与背景配置的编辑体验。

- 同步调整菜单相关 UI，将 StartMenuForm 迁移为 MenuForm，并更新 UIForm 配置、菜单 Controller/Form 以及相关 prefab 引用。更新多个 UI prefab 和通用按钮 prefab，使菜单、商店、角色选择、道具展示等界面能够使用新的按钮选中与导航交互。

Assets/GameMain/UI/UIItems/DisplayItem.prefab

@@ -10,7 +10,6 @@ GameObject:
   m_Component:
   - component: {fileID: 3448502482762597571}
   - component: {fileID: 2817356147833661953}
-  - component: {fileID: 1037051458616003099}
   - component: {fileID: 8108003253794388876}
   - component: {fileID: 8968323939827146374}
   m_Layer: 5
@@ -48,36 +47,6 @@ CanvasRenderer:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 257858949270972103}
   m_CullTransparentMesh: 1
---- !u!114 &1037051458616003099
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 257858949270972103}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: fe87c0e1cc204ed48ad3b37840f39efc, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  m_Material: {fileID: 0}
-  m_Color: {r: 0.11764706, g: 0.11764706, b: 0.11764706, a: 1}
-  m_RaycastTarget: 1
-  m_RaycastPadding: {x: 0, y: 0, z: 0, w: 0}
-  m_Maskable: 1
-  m_OnCullStateChanged:
-    m_PersistentCalls:
-      m_Calls: []
-  m_Sprite: {fileID: 21300000, guid: 9f847ec5e66e03e4ead1d3c5f7b510e8, type: 3}
-  m_Type: 1
-  m_PreserveAspect: 0
-  m_FillCenter: 1
-  m_FillMethod: 4
-  m_FillAmount: 1
-  m_FillClockwise: 1
-  m_FillOrigin: 0
-  m_UseSpriteMesh: 0
-  m_PixelsPerUnitMultiplier: 1
 --- !u!114 &8108003253794388876
 MonoBehaviour:
   m_ObjectHideFlags: 0
@@ -104,6 +73,39 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: a5079836f95c2a44b96fa331487ebb70, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  m_Navigation:
+    m_Mode: 3
+    m_WrapAround: 0
+    m_SelectOnUp: {fileID: 0}
+    m_SelectOnDown: {fileID: 0}
+    m_SelectOnLeft: {fileID: 0}
+    m_SelectOnRight: {fileID: 0}
+  m_Transition: 0
+  m_Colors:
+    m_NormalColor: {r: 1, g: 1, b: 1, a: 1}
+    m_HighlightedColor: {r: 0.9607843, g: 0.9607843, b: 0.9607843, a: 1}
+    m_PressedColor: {r: 0.78431374, g: 0.78431374, b: 0.78431374, a: 1}
+    m_SelectedColor: {r: 0.9607843, g: 0.9607843, b: 0.9607843, a: 1}
+    m_DisabledColor: {r: 0.78431374, g: 0.78431374, b: 0.78431374, a: 0.5019608}
+    m_ColorMultiplier: 1
+    m_FadeDuration: 0.1
+  m_SpriteState:
+    m_HighlightedSprite: {fileID: 0}
+    m_PressedSprite: {fileID: 0}
+    m_SelectedSprite: {fileID: 0}
+    m_DisabledSprite: {fileID: 0}
+  m_AnimationTriggers:
+    m_NormalTrigger: Normal
+    m_HighlightedTrigger: Highlighted
+    m_PressedTrigger: Pressed
+    m_SelectedTrigger: Selected
+    m_DisabledTrigger: Disabled
+  m_Interactable: 1
+  m_TargetGraphic: {fileID: 0}
+  m_OnClick:
+    m_PersistentCalls:
+      m_Calls: []
+  _background: {fileID: 2138039234147195629}
   _onPointerEnterAction:
     m_PersistentCalls:
       m_Calls:
@@ -149,7 +151,6 @@ MonoBehaviour:
           m_StringArgument: 
           m_BoolArgument: 0
         m_CallState: 2
-  _enableFade: 0
 --- !u!1001 &4063068678868026313
 PrefabInstance:
   m_ObjectHideFlags: 0
@@ -158,6 +159,11 @@ PrefabInstance:
     serializedVersion: 3
     m_TransformParent: {fileID: 3448502482762597571}
     m_Modifications:
+    - target: {fileID: 584092194682812729, guid: d5396f61766946c4db970694836a49fc,
+        type: 3}
+      propertyPath: m_IsActive
+      value: 1
+      objectReference: {fileID: 0}
     - target: {fileID: 1933500728459274583, guid: d5396f61766946c4db970694836a49fc,
         type: 3}
       propertyPath: m_AnchorMax.x
@@ -288,6 +294,11 @@ PrefabInstance:
       propertyPath: m_LocalEulerAnglesHint.z
       value: 0
       objectReference: {fileID: 0}
+    - target: {fileID: 2257813602893232910, guid: d5396f61766946c4db970694836a49fc,
+        type: 3}
+      propertyPath: m_IsActive
+      value: 1
+      objectReference: {fileID: 0}
     - target: {fileID: 8492647102234125480, guid: d5396f61766946c4db970694836a49fc,
         type: 3}
       propertyPath: m_Name
@@ -358,6 +369,18 @@ PrefabInstance:
     m_AddedGameObjects: []
     m_AddedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: d5396f61766946c4db970694836a49fc, type: 3}
+--- !u!114 &2138039234147195629 stripped
+MonoBehaviour:
+  m_CorrespondingSourceObject: {fileID: 2722773646958450980, guid: d5396f61766946c4db970694836a49fc,
+    type: 3}
+  m_PrefabInstance: {fileID: 4063068678868026313}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: fe87c0e1cc204ed48ad3b37840f39efc, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
 --- !u!224 &2563272144824088918 stripped
 RectTransform:
   m_CorrespondingSourceObject: {fileID: 2013242078151408287, guid: d5396f61766946c4db970694836a49fc,