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/middleware-serde/dist-es/serializerMiddleware.js

@@ -0,0 +1,14 @@
+export const serializerMiddleware = (options, serializer) => (next, context) => async (args) => {
+    const endpointConfig = options;
+    const endpoint = context.endpointV2?.url && endpointConfig.urlParser
+        ? async () => endpointConfig.urlParser(context.endpointV2.url)
+        : endpointConfig.endpoint;
+    if (!endpoint) {
+        throw new Error("No valid endpoint provider available.");
+    }
+    const request = await serializer(args.input, { ...options, endpoint });
+    return next({
+        ...args,
+        request,
+    });
+};