💸 chore: Align subscription pricing display with global currency settings

Unify subscription price rendering to use the site-wide currency symbol/rate on the wallet and admin views.
Make subscription plan currency read-only in the editor and force USD on create/update to avoid drift.
Use global currency display type when creating Creem checkout payloads.

web/src/components/table/subscriptions/SubscriptionsColumnDefs.jsx

@@ -19,6 +19,7 @@ For commercial licensing, please contact support@quantumnous.com
 
 import React from 'react';
 import { Button, Modal, Space, Tag } from '@douyinfe/semi-ui';
+import { convertUSDToCurrency } from '../../helpers/render';
 
 const quotaTypeLabel = (quotaType) => (quotaType === 1 ? '按次' : '按量');
 
@@ -48,8 +49,8 @@ const renderPlanTitle = (text, record) => {
   );
 };
 
-const renderPrice = (text, record) => {
-  return `${record?.plan?.currency || 'USD'} ${Number(text || 0).toFixed(2)}`;
+const renderPrice = (text) => {
+  return convertUSDToCurrency(Number(text || 0), 2);
 };
 
 const renderDuration = (text, record, t) => {