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/@aws-sdk/middleware-flexible-checksums/dist-es/isStreaming.js

@@ -0,0 +1,2 @@
+import { isArrayBuffer } from "@smithy/is-array-buffer";
+export const isStreaming = (body) => body !== undefined && typeof body !== "string" && !ArrayBuffer.isView(body) && !isArrayBuffer(body);