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/escape-element.js

@@ -0,0 +1,12 @@
+export function escapeElement(value) {
+    return value
+        .replace(/&/g, "&")
+        .replace(/"/g, """)
+        .replace(/'/g, "'")
+        .replace(/</g, "&lt;")
+        .replace(/>/g, "&gt;")
+        .replace(/\r/g, "&#x0D;")
+        .replace(/\n/g, "&#x0A;")
+        .replace(/\u0085/g, "&#x85;")
+        .replace(/\u2028/, "&#x2028;");
+}