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/abort-controller/polyfill.mjs

@@ -0,0 +1,19 @@
+/*globals self, window */
+import * as ac from "./dist/abort-controller"
+
+/*eslint-disable @mysticatea/prettier */
+const g =
+    typeof self !== "undefined" ? self :
+    typeof window !== "undefined" ? window :
+    typeof global !== "undefined" ? global :
+    /* otherwise */ undefined
+/*eslint-enable @mysticatea/prettier */
+
+if (g) {
+    if (typeof g.AbortController === "undefined") {
+        g.AbortController = ac.AbortController
+    }
+    if (typeof g.AbortSignal === "undefined") {
+        g.AbortSignal = ac.AbortSignal
+    }
+}