chore: 新增通用高斯模糊材质资源

添加了UI通用的高斯模糊材质文件及其.meta配置，用于后续UI特效渲染使用

Assets/Res/ui/common/高斯模糊通用.mat

@@ -7,7 +7,7 @@ Material:
   m_CorrespondingSourceObject: {fileID: 0}
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
-  m_Name: "\u9AD8\u65AF\u6A21\u7CCA"
+  m_Name: "\u9AD8\u65AF\u6A21\u7CCA\u901A\u7528"
   m_Shader: {fileID: 4800000, guid: 2777693b621900141a534bddd40419ef, type: 3}
   m_Parent: {fileID: 0}
   m_ModifiedSerializedProperties: 0
@@ -73,7 +73,7 @@ Material:
     - _Mode: 0
     - _OcclusionStrength: 1
     - _Parallax: 0.02
-    - _Size: 0.5
+    - _Size: 1.5
     - _SmoothnessTextureChannel: 0
     - _SpecularHighlights: 1
     - _SrcBlend: 1