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/isEmpty.js

@@ -0,0 +1,10 @@
+import assertString from './util/assertString';
+import merge from './util/merge';
+var default_is_empty_options = {
+  ignore_whitespace: false
+};
+export default function isEmpty(str, options) {
+  assertString(str);
+  options = merge(options, default_is_empty_options);
+  return (options.ignore_whitespace ? str.trim().length : str.length) === 0;
+}