fix: 修复 GetBytesSize 方法中大数值单位转换错误

原循环逻辑在 size 等于 1024 时会提前返回 "1024B"，而不是正确的 "1KB"。同时，对于超过 PB 单位的极大值处理不当。
重构循环条件，确保正确进行单位换算，并优化输出格式，保留两位小数并去除尾部零。

Author: AlianBlank

Runtime/Utility/Utility.File.cs

@@ -8,7 +8,7 @@ public static partial class Utility
         [UnityEngine.Scripting.Preserve]
         public static class File
         {
-            private static readonly string[] UnitList = new[] {"B", "KB", "MB", "GB", "TB", "PB"};
+            private static readonly string[] UnitList = new[] { "B", "KB", "MB", "GB", "TB", "PB" };
 
             /// <summary>
             /// 获取字节大小
@@ -18,17 +18,23 @@ public static class File
             [UnityEngine.Scripting.Preserve]
             public static string GetBytesSize(long size)
             {
-                foreach (var unit in UnitList)
+                double dSize = size;
+                int unitIndex = 0;
+
+                while (dSize >= 1024 && unitIndex < UnitList.Length - 1)
                 {
-                    if (size <= 1024)
-                    {
-                        return size + unit;
-                    }
+                    dSize /= 1024;
+                    unitIndex++;
+                }
 
-                    size /= 1024;
+                if (unitIndex == 0)
+                {
+                    return dSize + UnitList[unitIndex];
                 }
 
-                return size + UnitList[0];
+                // 格式化为保留两位小数，但去除尾部不必要的零
+                string formattedSize = dSize.ToString("F2").TrimEnd('0').TrimEnd('.');
+                return formattedSize + UnitList[unitIndex];
             }
         }
     }