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/isJSON.js

@@ -0,0 +1,20 @@
+function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
+import assertString from './util/assertString';
+import includes from './util/includesArray';
+import merge from './util/merge';
+var default_json_options = {
+  allow_primitives: false
+};
+export default function isJSON(str, options) {
+  assertString(str);
+  try {
+    options = merge(options, default_json_options);
+    var primitives = [];
+    if (options.allow_primitives) {
+      primitives = [null, false, true];
+    }
+    var obj = JSON.parse(str);
+    return includes(primitives, obj) || !!obj && _typeof(obj) === 'object';
+  } catch (e) {/* ignore */}
+  return false;
+}