fix: add missing using

Endpoint/Configuration/Core/Startup/LoggerConfiguration.cs

@@ -8,6 +8,7 @@ using Serilog.Context;
 using Serilog.Events;
 using Serilog.Filters;
 using Serilog.Formatting.Compact;
+using System;
 using System.Diagnostics;
 using System.IO;
 
@@ -45,11 +46,9 @@ public static class LoggerConfiguration
                     rollingInterval: RollingInterval.Day);
             }
 
-#if !DEBUG
             if (generalConfig != null && !string.IsNullOrEmpty(generalConfig.ApiServerSeq) &&
                 Uri.TryCreate(generalConfig.ApiServerSeq, UriKind.Absolute, out var _))
                 configuration.WriteTo.Seq(generalConfig.ApiServerSeq, apiKey: generalConfig.ApiKeySeq);
-#endif
 
             configuration
                 .MinimumLevel.Override("Microsoft.AspNetCore.Hosting", LogEventLevel.Warning)