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/express-validator/lib/context-items/custom-validation.d.ts

@@ -0,0 +1,10 @@
+import { CustomValidator, Meta } from '../base';
+import { Context } from '../context';
+import { ContextItem } from './context-item';
+export declare class CustomValidation implements ContextItem {
+    private readonly validator;
+    private readonly negated;
+    message: any;
+    constructor(validator: CustomValidator, negated: boolean);
+    run(context: Context, value: any, meta: Meta): Promise<void>;
+}