fix: standardize currency and input selection styles

src/apps/client/ClientBillingPage.tsx

@@ -2,6 +2,7 @@ import { useEffect, useState } from 'react';
 import { CreditCard } from 'lucide-react';
 import { Button, Pagination, Tag } from '@/components/ui';
 import { clientApi, type BillingPlan } from '@/api/adminApi';
+import { formatCents } from '@/utils/currency';
 
 export function ClientBillingPage() {
   const [plans, setPlans] = useState<BillingPlan[]>([]);
@@ -54,7 +55,7 @@ export function ClientBillingPage() {
               <strong>{plan.smsUnits.toLocaleString('zh-CN')} 条</strong>
               <p className="muted">{plan.description ?? '适合阶段性短信发送和活动通知。'}</p>
               <Button icon={<CreditCard size={16} />} onClick={() => createOrder(plan)} variant={plan.smsUnits >= 100000 ? 'primary' : 'ghost'}>
-                ¥{(plan.amountCents / 100).toLocaleString('zh-CN')} 立即充值
+                ¥{formatCents(plan.amountCents)} 立即充值
               </Button>
             </article>
           ))}