fix: 修复配额说明重复和undefined问题

- 在editStorageForm中初始化oss_storage_quota_value和oss_quota_unit
- 删除重复的旧配额说明块，保留新的当前配额设置显示

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/backup.bat

@@ -0,0 +1,52 @@
+@echo off
+chcp 65001 >nul
+echo ========================================
+echo   数据库备份工具
+echo ========================================
+echo.
+
+cd /d %~dp0
+
+REM 创建备份目录
+if not exist backup mkdir backup
+
+REM 生成时间戳
+set YEAR=%date:~0,4%
+set MONTH=%date:~5,2%
+set DAY=%date:~8,2%
+set HOUR=%time:~0,2%
+set MINUTE=%time:~3,2%
+set SECOND=%time:~6,2%
+
+REM 去掉小时前面的空格
+if "%HOUR:~0,1%" == " " set HOUR=0%HOUR:~1,1%
+
+set TIMESTAMP=%YEAR%%MONTH%%DAY%_%HOUR%%MINUTE%%SECOND%
+
+REM 备份数据库
+copy ftp-manager.db backup\ftp-manager-%TIMESTAMP%.db >nul
+
+if %errorlevel% == 0 (
+    echo [成功] 备份完成！
+    echo 文件: backup\ftp-manager-%TIMESTAMP%.db
+
+    REM 获取文件大小
+    for %%A in (backup\ftp-manager-%TIMESTAMP%.db) do echo 大小: %%~zA 字节
+) else (
+    echo [错误] 备份失败！
+)
+
+echo.
+
+REM 清理30天前的备份
+echo 清理30天前的旧备份...
+forfiles /P backup /M ftp-manager-*.db /D -30 /C "cmd /c del @path" 2>nul
+if %errorlevel% == 0 (
+    echo [成功] 旧备份已清理
+) else (
+    echo [提示] 没有需要清理的旧备份
+)
+
+echo.
+echo ========================================
+pause