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-cjs/splitStream.js

@@ -0,0 +1,16 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.splitStream = splitStream;
+const stream_1 = require("stream");
+const splitStream_browser_1 = require("./splitStream.browser");
+const stream_type_check_1 = require("./stream-type-check");
+async function splitStream(stream) {
+    if ((0, stream_type_check_1.isReadableStream)(stream) || (0, stream_type_check_1.isBlob)(stream)) {
+        return (0, splitStream_browser_1.splitStream)(stream);
+    }
+    const stream1 = new stream_1.PassThrough();
+    const stream2 = new stream_1.PassThrough();
+    stream.pipe(stream1);
+    stream.pipe(stream2);
+    return [stream1, stream2];
+}