fix: 调整进度条的步幅

server/src/Hubs/ProgressHub.cs

@@ -37,7 +37,7 @@ public class ProgressInfo
 {
     public required string TaskId { get; set; }
     public required ProgressStatus Status { get; set; }
-    public required int ProgressPercent { get; set; }
+    public required double ProgressPercent { get; set; }
     public required string ErrorMessage { get; set; }
 };