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/merge.js

@@ -0,0 +1,18 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = merge;
+function merge() {
+  var obj = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+  var defaults = arguments.length > 1 ? arguments[1] : undefined;
+  for (var key in defaults) {
+    if (typeof obj[key] === 'undefined') {
+      obj[key] = defaults[key];
+    }
+  }
+  return obj;
+}
+module.exports = exports.default;
+module.exports.default = exports.default;