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/MessageEncoderStream.js

@@ -0,0 +1,18 @@
+export class MessageEncoderStream {
+    options;
+    constructor(options) {
+        this.options = options;
+    }
+    [Symbol.asyncIterator]() {
+        return this.asyncIterator();
+    }
+    async *asyncIterator() {
+        for await (const msg of this.options.messageStream) {
+            const encoded = this.options.encoder.encode(msg);
+            yield encoded;
+        }
+        if (this.options.includeEndFrame) {
+            yield new Uint8Array(0);
+        }
+    }
+}