```

feat(EnemyBaseMove): 添加重力系统和物理材质优化

- 添加重力加速度变量和垂直速度控制
- 实现applyGravity()和getVerticalVelocity()方法处理垂直运动
- 在Attack状态和静止时应用重力效果
- 为CharacterController添加新的物理材质引用
- 调整CharacterController中心位置从(0,0,0)到(0,1,0)
- 在场景中禁用根动作应用以配合自定义移动系统
```

Assets/Scenes/SampleScene.scene

@@ -124,18 +124,6 @@ NavMeshSettings:
     debug:
       m_Flags: 0
   m_NavMeshData: {fileID: 0}
---- !u!134 &14211372
-PhysicMaterial:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_Name: 
-  dynamicFriction: 0.6
-  staticFriction: 0.6
-  bounciness: 0
-  frictionCombine: 0
-  bounceCombine: 0
 --- !u!1 &46311543
 GameObject:
   m_ObjectHideFlags: 0
@@ -1429,6 +1417,11 @@ PrefabInstance:
       value: 
       objectReference: {fileID: 22100000, guid: c205ebfae56f644af94a7948cc0609be,
         type: 2}
+    - target: {fileID: 5866666021909216657, guid: aedf6e849dd924e229c57640f99ff50a,
+        type: 3}
+      propertyPath: m_ApplyRootMotion
+      value: 0
+      objectReference: {fileID: 0}
     m_RemovedComponents: []
     m_RemovedGameObjects: []
     m_AddedGameObjects: []
@@ -1455,7 +1448,7 @@ CharacterController:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 989436104}
-  m_Material: {fileID: 14211372}
+  m_Material: {fileID: 1431018394}
   m_IncludeLayers:
     serializedVersion: 2
     m_Bits: 0
@@ -1473,7 +1466,7 @@ CharacterController:
   m_StepOffset: 0.3
   m_SkinWidth: 0.08
   m_MinMoveDistance: 0.001
-  m_Center: {x: 0, y: 0, z: 0}
+  m_Center: {x: 0, y: 1, z: 0}
 --- !u!114 &989436106
 MonoBehaviour:
   m_ObjectHideFlags: 0
@@ -1764,6 +1757,18 @@ MeshFilter:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 1369034729}
   m_Mesh: {fileID: 10202, guid: 0000000000000000e000000000000000, type: 0}
+--- !u!134 &1431018394
+PhysicMaterial:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: ' (Instance)'
+  dynamicFriction: 0.6
+  staticFriction: 0.6
+  bounciness: 0
+  frictionCombine: 0
+  bounceCombine: 0
 --- !u!1 &1489219289
 GameObject:
   m_ObjectHideFlags: 0