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/minimist/test/whitespace.js

@@ -0,0 +1,10 @@
+'use strict';
+
+var parse = require('../');
+var test = require('tape');
+
+test('whitespace should be whitespace', function (t) {
+	t.plan(1);
+	var x = parse(['-x', '\t']).x;
+	t.equal(x, '\t');
+});