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/lazystream/test/helper.js

@@ -0,0 +1,39 @@
+
+var _Readable = require('readable-stream/readable');
+var _Writable = require('readable-stream/writable');
+var util = require('util');
+
+module.exports = {
+  DummyReadable: DummyReadable,
+  DummyWritable: DummyWritable
+};
+
+function DummyReadable(strings) {
+  _Readable.call(this);
+  this.strings = strings;
+  this.emit('readable');
+}
+
+util.inherits(DummyReadable, _Readable);
+
+DummyReadable.prototype._read = function _read(n) {
+  if (this.strings.length) {
+    this.push(new Buffer(this.strings.shift()));
+  } else {
+    this.push(null);
+  }
+};
+
+function DummyWritable(strings) {
+  _Writable.call(this);
+  this.strings = strings;
+  this.emit('writable');
+}
+
+util.inherits(DummyWritable, _Writable);
+
+DummyWritable.prototype._write = function _write(chunk, encoding, callback) {
+  this.strings.push(chunk.toString());
+  if (callback) callback();
+};
+