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/lib/util/toString.js

@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = toString;
+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); }
+function toString(input) {
+  if (_typeof(input) === 'object' && input !== null) {
+    if (typeof input.toString === 'function') {
+      input = input.toString();
+    } else {
+      input = '[object Object]';
+    }
+  } else if (input === null || typeof input === 'undefined' || isNaN(input) && !input.length) {
+    input = '';
+  }
+  return String(input);
+}
+module.exports = exports.default;
+module.exports.default = exports.default;