fix(UI): 修复文件末尾缺少换行符和初始化问题

修复 IUIFormHelper.cs 和 UIFormHelperBase.cs 文件末尾缺少换行符的问题，确保符合代码规范。
在 OpenUIFormInfo.cs 中，将 m_AssetPath 的初始化从 `string.Empty` 改为默认值，并在 Clear 方法中正确重置 m_AssetPath 和 m_AssetName 字段，避免潜在的引用残留。

Author: AlianBlank

Runtime/UI/IUIFormHelper.cs

@@ -64,4 +64,4 @@ public interface IUIFormHelper
         /// <param name="uiFormAssetName">界面资源名称。</param>
         void ReleaseUIForm(object uiFormAsset, object uiFormInstance, object assetHandle, string uiFormAssetPath, string uiFormAssetName);
     }
-}
+}

Runtime/UI/OpenUIFormInfo.cs

@@ -45,7 +45,7 @@ public sealed class OpenUIFormInfo : IReference
         private Type m_FormType;
         private object m_AssetHandle;
         private bool m_IsFullScreen = false;
-        private string m_AssetPath = string.Empty;
+        private string m_AssetPath;
         private string m_AssetName;
 
         /// <summary>
@@ -154,6 +154,8 @@ public void Clear()
             m_FormType = default;
             m_AssetHandle = default;
             m_IsFullScreen = default;
+            m_AssetPath = default;
+            m_AssetName = default;
         }
     }
 }

Runtime/UIFormHelperBase.cs

@@ -66,4 +66,4 @@ public abstract class UIFormHelperBase : MonoBehaviour, IUIFormHelper
         /// <param name="uiFormAssetName">界面资源名称。</param>
         public abstract void ReleaseUIForm(object uiFormAsset, object uiFormInstance, object assetHandle, string uiFormAssetPath, string uiFormAssetName);
     }
-}
+}