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/node-http-handler/dist-es/readable.mock.js

@@ -0,0 +1,21 @@
+import { Readable } from "stream";
+export class ReadFromBuffers extends Readable {
+    buffersToRead;
+    numBuffersRead = 0;
+    errorAfter;
+    constructor(options) {
+        super(options);
+        this.buffersToRead = options.buffers;
+        this.errorAfter = typeof options.errorAfter === "number" ? options.errorAfter : -1;
+    }
+    _read() {
+        if (this.errorAfter !== -1 && this.errorAfter === this.numBuffersRead) {
+            this.emit("error", new Error("Mock Error"));
+            return;
+        }
+        if (this.numBuffersRead >= this.buffersToRead.length) {
+            return this.push(null);
+        }
+        return this.push(this.buffersToRead[this.numBuffersRead++]);
+    }
+}