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/toBoolean.js

@@ -0,0 +1,8 @@
+import assertString from './util/assertString';
+export default function toBoolean(str, strict) {
+  assertString(str);
+  if (strict) {
+    return str === '1' || /^true$/i.test(str);
+  }
+  return str !== '0' && !/^false$/i.test(str) && str !== '';
+}