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/@smithy/protocol-http/dist-es/isValidHostname.js

@@ -0,0 +1,4 @@
+export function isValidHostname(hostname) {
+    const hostPattern = /^[a-z0-9][a-z0-9\.\-]*[a-z0-9]$/;
+    return hostPattern.test(hostname);
+}