Switch to binary serialization; add IEntityComment interface

- Introduced IEntityComment interface for entity comments.
- Changed SignalR client message serialization to binary.
- Updated SignalResponseDataMessage docs for GZip (was Brotli).
- Refactored GetResponseData<T> for GZip decompression and improved error handling.
- Added necessary using statements for new interface and features.

AyCode.Interfaces/EntityComment/IEntityComment.cs

@@ -0,0 +1,15 @@
+using AyCode.Interfaces.Entities;
+using AyCode.Interfaces.TimeStampInfo;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AyCode.Interfaces.EntityComment
+{
+    public interface IEntityComment
+    {
+        public string Comment { get; set; }
+    }
+}

AyCode.Services.Server/SignalRs/AcSignalRSendToClientService.cs

@@ -1,6 +1,7 @@
 using AyCode.Core.Extensions;
 using AyCode.Core.Helpers;
 using AyCode.Core.Loggers;
+using AyCode.Core.Serializers.Binaries;
 using AyCode.Core.Serializers.Jsons;
 using AyCode.Services.SignalRs;
 using Microsoft.AspNetCore.SignalR;
@@ -14,7 +15,7 @@ public abstract class AcSignalRSendToClientService<TSignalRHub, TSignalRTags, TL
 
     protected virtual async Task SendMessageToClient(IAcSignalRHubItemServer sendTo, int messageTag, object? content)
     {
-        var response = new SignalResponseDataMessage(messageTag, SignalResponseStatus.Success, content, AcJsonSerializerOptions.Default);
+        var response = new SignalResponseDataMessage(messageTag, SignalResponseStatus.Success, content, AcBinarySerializerOptions.Default);
         var responseBytes = response.ToBinary();
 
         Logger.Info($"[{responseBytes.Length / 1024}kb] Server sending to client; {ConstHelper.NameByValue<TSignalRTags>(messageTag)}");

AyCode.Services/SignalRs/IAcSignalRHubClient.cs

@@ -137,7 +137,7 @@ public enum SignalResponseStatus : byte
 
 /// <summary>
 /// Unified signal response message that supports both JSON and Binary serialization.
-/// JSON mode uses Brotli compression for reduced payload size.
+/// JSON mode uses GZip compression for reduced payload size.
 /// Optimized: uses pooled buffers for decompression, zero-copy deserialization path.
 /// </summary>
 public sealed class SignalResponseDataMessage : ISignalResponseMessage, IDisposable
@@ -183,28 +183,29 @@ public sealed class SignalResponseDataMessage : ISignalResponseMessage, IDisposa
         if (_cachedResponseData != null) return (T)_cachedResponseData;
         if (ResponseData == null) return default;
 
-        if (DataSerializerType == AcSerializerType.Binary)
+        try
         {
-            try
+            if (DataSerializerType == AcSerializerType.Binary)
             {
                 // Log diagnostics if enabled
                 LogResponseDataDiagnostics<T>();
-                
+
                 return (T)(_cachedResponseData = ResponseData.BinaryTo<T>()!);
             }
-            catch (Exception ex)
-            {
-                // Log detailed error diagnostics
-                LogResponseDataError<T>(ex);
-                throw;
-            }
-        }
 
-        // Decompress Brotli to pooled buffer and deserialize directly
-        EnsureDecompressed();
-        var result = AcJsonDeserializer.Deserialize<T>(new ReadOnlySpan<byte>(_rentedDecompressedBuffer, 0, _decompressedLength));
-        _cachedResponseData = result;
-        return result;
+            // Decompress GZip to pooled buffer and deserialize directly
+            EnsureDecompressed();
+
+            var result = AcJsonDeserializer.Deserialize<T>(new ReadOnlySpan<byte>(_rentedDecompressedBuffer, 0, _decompressedLength));
+            _cachedResponseData = result;
+            return result;
+        }
+        catch (Exception ex)
+        {
+            // Log detailed error diagnostics
+            LogResponseDataError<T>(ex);
+            throw;
+        }
     }
 
     private void LogResponseDataDiagnostics<T>()