优化临时目录初始化逻辑，移除对已存在文件的检查，简化目录创建流程

Update.cs

@@ -1022,28 +1022,23 @@ namespace CheckDownload
         /// <summary>
         /// 初始化程序使用的临时目录，用于存储下载过程中的临时文件
         /// </summary>
-        private void InitializeTempDirectory()
-        {
-            try
-            {
-                string exeDir = AppDomain.CurrentDomain.BaseDirectory;
-
-                _tempDirectory = Path.Combine(exeDir, "Temp");
-
-                if (File.Exists(_tempDirectory))
-                {
-                    throw new IOException($"无法创建目录，因为已存在同名文件: {_tempDirectory}");
-                }
-
-                if (!Directory.Exists(_tempDirectory))
-                {
-                    Directory.CreateDirectory(_tempDirectory);
-                }
-            }
-            catch (Exception ex)
-            {
-                throw new Exception("初始化临时目录 (InitializeTempDirectory)", ex);
-            }
+        private void InitializeTempDirectory()
+        {
+            try
+            {
+                string exeDir = AppDomain.CurrentDomain.BaseDirectory;
+
+                _tempDirectory = Path.Combine(exeDir, "Temp");
+                
+                if (!Directory.Exists(_tempDirectory))
+                {
+                    Directory.CreateDirectory(_tempDirectory);
+                }
+            }
+            catch (Exception ex)
+            {
+                throw new Exception("初始化临时目录 (InitializeTempDirectory)", ex);
+            }
         }
 
         /// <summary>