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/@smithy/node-http-handler/dist-es/timing.js

@@ -0,0 +1,4 @@
+export const timing = {
+    setTimeout: (cb, ms) => setTimeout(cb, ms),
+    clearTimeout: (timeoutId) => clearTimeout(timeoutId),
+};