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/events-universal/README.md

@@ -0,0 +1,17 @@
+# events-universal
+
+Universal wrapper for the Node.js `events` module.
+
+```
+npm i events-universal
+```
+
+## Usage
+
+```js
+const EventEmitter = require('events-universal')
+```
+
+## License
+
+Apache-2.0