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/eventstream-serde-browser/dist-es/utils.js

@@ -0,0 +1,28 @@
+export const readableStreamtoIterable = (readableStream) => ({
+    [Symbol.asyncIterator]: async function* () {
+        const reader = readableStream.getReader();
+        try {
+            while (true) {
+                const { done, value } = await reader.read();
+                if (done)
+                    return;
+                yield value;
+            }
+        }
+        finally {
+            reader.releaseLock();
+        }
+    },
+});
+export const iterableToReadableStream = (asyncIterable) => {
+    const iterator = asyncIterable[Symbol.asyncIterator]();
+    return new ReadableStream({
+        async pull(controller) {
+            const { done, value } = await iterator.next();
+            if (done) {
+                return controller.close();
+            }
+            controller.enqueue(value);
+        },
+    });
+};