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-codec/dist-es/MessageDecoderStream.js

@@ -0,0 +1,15 @@
+export class MessageDecoderStream {
+    options;
+    constructor(options) {
+        this.options = options;
+    }
+    [Symbol.asyncIterator]() {
+        return this.asyncIterator();
+    }
+    async *asyncIterator() {
+        for await (const bytes of this.options.inputStream) {
+            const decoded = this.options.decoder.decode(bytes);
+            yield decoded;
+        }
+    }
+}