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/sanitization.d.ts

@@ -0,0 +1,12 @@
+import { Context } from '../context';
+import { CustomSanitizer, Meta, StandardSanitizer } from '../base';
+import { toString as toStringImpl } from '../utils';
+import { ContextItem } from './context-item';
+export declare class Sanitization implements ContextItem {
+    private readonly sanitizer;
+    private readonly custom;
+    private readonly options;
+    private readonly stringify;
+    constructor(sanitizer: StandardSanitizer | CustomSanitizer, custom: boolean, options?: any[], stringify?: typeof toStringImpl);
+    run(context: Context, value: any, meta: Meta): Promise<void>;
+}