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/node_modules/validator/es/lib/isMD5.js

@@ -0,0 +1,6 @@
+import assertString from './util/assertString';
+var md5 = /^[a-f0-9]{32}$/;
+export default function isMD5(str) {
+  assertString(str);
+  return md5.test(str);
+}