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/region-config-resolver/dist-es/extensions/index.js

@@ -0,0 +1,15 @@
+export const getAwsRegionExtensionConfiguration = (runtimeConfig) => {
+    return {
+        setRegion(region) {
+            runtimeConfig.region = region;
+        },
+        region() {
+            return runtimeConfig.region;
+        },
+    };
+};
+export const resolveAwsRegionExtensionConfiguration = (awsRegionExtensionConfiguration) => {
+    return {
+        region: awsRegionExtensionConfiguration.region(),
+    };
+};