fix：数据查询优化排序问题

common/src/main/java/com/sdm/common/utils/FileSizeUtils.java

@@ -73,24 +73,51 @@ public class FileSizeUtils {
      * @param unit 文件大小单位 (B, KB, MB, GB, TB)
      * @return 字节大小
      */
-    public static Long convertToBytes(Long size, String unit) {
+    public static Long convertToBytes(BigDecimal size, String unit) {
         if (size == null || unit == null) {
             return null;
         }
 
+        BigDecimal result;
         switch (unit.toUpperCase()) {
-            case "B":
-                return size;
-            case "KB":
-                return size * 1024L;
-            case "MB":
-                return size * 1024L * 1024L;
-            case "GB":
-                return size * 1024L * 1024L * 1024L;
-            case "TB":
-                return size * 1024L * 1024L * 1024L * 1024L;
-            default:
-                return size; // 默认认为是字节
+            case "B" -> result = size;
+            case "KB" -> result = size.multiply(new BigDecimal("1024"));
+            case "MB" -> result = size.multiply(new BigDecimal("1048576")); // 1024^2
+            case "GB" -> result = size.multiply(new BigDecimal("1073741824")); // 1024^3
+            case "TB" -> result = size.multiply(new BigDecimal("1099511627776")); // 1024^4
+            default -> result = size;
+        }
+        
+        return result.longValue();
+    }
+
+    /**
+     * 将格式化后的文件大小字符串转换为字节数
+     * @param formatFileSize 格式化后的文件大小（如 "1.06 KB", "6.02 MB", "1.06KB"）
+     * @return 字节数
+     */
+    public static Long parseFileSizeToBytes(String formatFileSize) {
+        if (formatFileSize == null || formatFileSize.trim().isEmpty()) {
+            return 0L;
+        }
+
+        formatFileSize = formatFileSize.trim().toUpperCase();
+        
+        // 使用正则表达式匹配数字和单位
+        // 匹配模式：数字（可能包含小数点）+ 可选的空白 + 单位
+        java.util.regex.Pattern pattern = java.util.regex.Pattern.compile("([\\d.]+)\\s*([A-Z]+)");
+        java.util.regex.Matcher matcher = pattern.matcher(formatFileSize);
+        
+        if (!matcher.matches()) {
+            return 0L;
+        }
+
+        try {
+            BigDecimal value = new BigDecimal(matcher.group(1));
+            String unit = matcher.group(2);
+            return convertToBytes(value, unit);
+        } catch (NumberFormatException e) {
+            return 0L;
         }
     }