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/util-stream/dist-es/splitStream.browser.js

@@ -0,0 +1,7 @@
+export async function splitStream(stream) {
+    if (typeof stream.stream === "function") {
+        stream = stream.stream();
+    }
+    const readableStream = stream;
+    return readableStream.tee();
+}