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/property-provider/dist-es/CredentialsProviderError.js

@@ -0,0 +1,8 @@
+import { ProviderError } from "./ProviderError";
+export class CredentialsProviderError extends ProviderError {
+    name = "CredentialsProviderError";
+    constructor(message, options = true) {
+        super(message, options);
+        Object.setPrototypeOf(this, CredentialsProviderError.prototype);
+    }
+}