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/middleware-flexible-checksums/dist-es/stringUnionSelector.js

@@ -0,0 +1,14 @@
+export var SelectorType;
+(function (SelectorType) {
+    SelectorType["ENV"] = "env";
+    SelectorType["CONFIG"] = "shared config entry";
+})(SelectorType || (SelectorType = {}));
+export const stringUnionSelector = (obj, key, union, type) => {
+    if (!(key in obj))
+        return undefined;
+    const value = obj[key].toUpperCase();
+    if (!Object.values(union).includes(value)) {
+        throw new TypeError(`Cannot load ${type} '${key}'. Expected one of ${Object.values(union)}, got '${obj[key]}'.`);
+    }
+    return value;
+};