fix(mini-user): 微信小程序补 Intl 兜底并去掉 toLocaleString

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/mini-user/src/pages/redeem/index.tsx

@@ -5,6 +5,7 @@ import PageShell from '../../components/PageShell';
 import SubPageHeader from '../../components/SubPageHeader';
 import { goLogin } from '../../lib/auth-nav';
 import { isLoggedIn, request, toast } from '../../lib/api';
+import { formatMoney } from '../../lib/money';
 
 type BenefitSummary = {
   totalBalance: number;
@@ -13,10 +14,6 @@ type BenefitSummary = {
 
 const MIN_REDEEM_AMOUNT = 0.01;
 
-function formatMoney(amount: number) {
-  return amount.toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
-}
-
 /**
  * 核销金额输入清洗：
  * - 只保留数字与一个小数点