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/chunked-blob-reader/dist-cjs/index.js

@@ -0,0 +1,13 @@
+'use strict';
+
+async function blobReader(blob, onChunk, chunkSize = 1024 * 1024) {
+    const size = blob.size;
+    let totalBytesRead = 0;
+    while (totalBytesRead < size) {
+        const slice = blob.slice(totalBytesRead, Math.min(size, totalBytesRead + chunkSize));
+        onChunk(new Uint8Array(await slice.arrayBuffer()));
+        totalBytesRead += slice.size;
+    }
+}
+
+exports.blobReader = blobReader;