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/util-stream/dist-es/headStream.js

@@ -0,0 +1,38 @@
+import { Writable } from "stream";
+import { headStream as headWebStream } from "./headStream.browser";
+import { isReadableStream } from "./stream-type-check";
+export const headStream = (stream, bytes) => {
+    if (isReadableStream(stream)) {
+        return headWebStream(stream, bytes);
+    }
+    return new Promise((resolve, reject) => {
+        const collector = new Collector();
+        collector.limit = bytes;
+        stream.pipe(collector);
+        stream.on("error", (err) => {
+            collector.end();
+            reject(err);
+        });
+        collector.on("error", reject);
+        collector.on("finish", function () {
+            const bytes = new Uint8Array(Buffer.concat(this.buffers));
+            resolve(bytes);
+        });
+    });
+};
+class Collector extends Writable {
+    buffers = [];
+    limit = Infinity;
+    bytesBuffered = 0;
+    _write(chunk, encoding, callback) {
+        this.buffers.push(chunk);
+        this.bytesBuffered += chunk.byteLength ?? 0;
+        if (this.bytesBuffered >= this.limit) {
+            const excess = this.bytesBuffered - this.limit;
+            const tailBuffer = this.buffers[this.buffers.length - 1];
+            this.buffers[this.buffers.length - 1] = tailBuffer.subarray(0, tailBuffer.byteLength - excess);
+            this.emit("finish");
+        }
+        callback();
+    }
+}