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/signature-v4/dist-es/prepareRequest.js

@@ -0,0 +1,11 @@
+import { HttpRequest } from "@smithy/protocol-http";
+import { GENERATED_HEADERS } from "./constants";
+export const prepareRequest = (request) => {
+    request = HttpRequest.clone(request);
+    for (const headerName of Object.keys(request.headers)) {
+        if (GENERATED_HEADERS.indexOf(headerName.toLowerCase()) > -1) {
+            delete request.headers[headerName];
+        }
+    }
+    return request;
+};