chore: delete temporary structs

Author: kengwang

Lagrange.Core/Internal/Events/System/FlashTransferEvent.cs

@@ -22,14 +22,6 @@ internal class FlashTransferFile(string fileId, uint index, string fileName, Str
 
     public byte[] FileMd5 { get; } = stream.Md5();
 
-    public static List<FlashTransferFileCategoryStatistic> CreateCategoryStatistics(IReadOnlyList<FlashTransferFile> files)
-    {
-        return files
-            .GroupBy(file => file.Category)
-            .OrderBy(group => group.Key)
-            .Select(group => new FlashTransferFileCategoryStatistic(group.Key, group.Count(), $"{ResolveCategoryName(group.Key)}({group.Count()})"))
-            .ToList();
-    }
 
     private static uint ResolveFileType(string fileName)
     {
@@ -98,7 +90,6 @@ internal enum FlashTransferFileCategory : uint
     Other = 6
 }
 
-internal readonly record struct FlashTransferFileCategoryStatistic(FlashTransferFileCategory Category, int Count, string DisplayName);
 
 internal class FlashTransferCreateFileSetEventReq(string title, string asciiTitle, List<FlashTransferFile> files) : ProtocolEvent
 {
@@ -108,7 +99,6 @@ internal class FlashTransferCreateFileSetEventReq(string title, string asciiTitl
 
     public List<FlashTransferFile> Files { get; } = files;
 
-    public List<FlashTransferFileCategoryStatistic> CategoryStatistics { get; } = FlashTransferFile.CreateCategoryStatistics(files);
 }
 
 internal class FlashTransferCreateFileSetEventResp(string fileSetId, string shareLink) : ProtocolEvent