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/is-array-buffer/dist-cjs/index.js

@@ -0,0 +1,6 @@
+'use strict';
+
+const isArrayBuffer = (arg) => (typeof ArrayBuffer === "function" && arg instanceof ArrayBuffer) ||
+    Object.prototype.toString.call(arg) === "[object ArrayBuffer]";
+
+exports.isArrayBuffer = isArrayBuffer;