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/@aws-sdk/xml-builder/dist-es/xml-parser.js

@@ -0,0 +1,15 @@
+import { XMLParser } from "fast-xml-parser";
+const parser = new XMLParser({
+    attributeNamePrefix: "",
+    htmlEntities: true,
+    ignoreAttributes: false,
+    ignoreDeclaration: true,
+    parseTagValue: false,
+    trimValues: false,
+    tagValueProcessor: (_, val) => (val.trim() === "" && val.includes("\n") ? "" : undefined),
+});
+parser.addEntity("#xD", "\r");
+parser.addEntity("#10", "\n");
+export function parseXML(xmlString) {
+    return parser.parse(xmlString, true);
+}