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/express-validator/lib/base.js

@@ -0,0 +1,8 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ValidationHalt = exports.contextsKey = void 0;
+// Not using Symbol because of #813
+exports.contextsKey = 'express-validator#contexts';
+class ValidationHalt extends Error {
+}
+exports.ValidationHalt = ValidationHalt;