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/strip-ansi-cjs/index.js

@@ -0,0 +1,4 @@
+'use strict';
+const ansiRegex = require('ansi-regex');
+
+module.exports = string => typeof string === 'string' ? string.replace(ansiRegex(), '') : string;