Remove unused usings from pipeline middleware

Cleaned up CompressMiddleware, HashMiddleware, and PatchMiddleware by removing unnecessary using directives to improve code clarity and maintainability.

Author: JusterZhu

src/c#/GeneralUpdate.ClientCore/Pipeline/CompressMiddleware.cs

@@ -1,11 +1,6 @@
-using System;
-using System.Diagnostics;
-using System.IO;
-using System.Text;
+using System.Text;
 using System.Threading.Tasks;
 using GeneralUpdate.Common.Compress;
-using GeneralUpdate.Common.Internal;
-using GeneralUpdate.Common.Internal.Event;
 using GeneralUpdate.Common.Internal.Pipeline;
 
 namespace GeneralUpdate.ClientCore.Pipeline;

src/c#/GeneralUpdate.ClientCore/Pipeline/HashMiddleware.cs

@@ -1,10 +1,7 @@
 using System;
-using System.Diagnostics;
 using System.Security.Cryptography;
 using System.Threading.Tasks;
 using GeneralUpdate.Common.HashAlgorithms;
-using GeneralUpdate.Common.Internal;
-using GeneralUpdate.Common.Internal.Event;
 using GeneralUpdate.Common.Internal.Pipeline;
 
 namespace GeneralUpdate.ClientCore.Pipeline;

src/c#/GeneralUpdate.ClientCore/Pipeline/PatchMiddleware.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Threading.Tasks;
-using GeneralUpdate.Common.FileBasic;
-using GeneralUpdate.Common.Internal;
-using GeneralUpdate.Common.Internal.Event;
+using System.Threading.Tasks;
 using GeneralUpdate.Common.Internal.Pipeline;
 using GeneralUpdate.Differential;