feat: 新增多语言文案与组件国际化适配

本次提交完成了大量多语言相关的新增与优化工作：
1. 新增充值、案例、会员资产、订单等页面的中文/英文翻译文案
2. 新增企业微信客服、时间选择、支付弹窗等组件的多语言包
3. 优化工具函数与自定义页面的多语言适配，替换硬编码提示文案
4. 新增会员等级规则、积分商品、退款管理等页面的国际化支持
5. 修复企业微信JS-SDK的错误提示文案硬编码问题

lang/en-us/components/ns-payment.js

@@ -0,0 +1,31 @@
+export const lang = {
+	// ===== ns-payment component =====
+	'nsPayment': {
+		// Popup title
+		paymentMethod: 'Payment Method',
+
+		// Pay amount
+		payAmount: 'Pay {amount} CNY',
+
+		// Balance deduction
+		balanceDeduction: 'Balance Deduction',
+		availableBalance: 'Available ¥{amount}',
+
+		// Empty state
+		noPaymentMethod: 'No payment methods configured yet!',
+
+		// Button
+		confirmPay: 'Confirm Payment',
+
+		// Payment method names
+		alipay: 'Alipay',
+		wechatpay: 'WeChat Pay',
+
+		// Toast messages
+		pleaseSelectPaymentMethod: 'Please select a payment method!',
+		paying: 'Processing payment...',
+		payInfoNotFound: 'Failed to get payment info!',
+		paymentCancelled: 'Payment cancelled',
+		paymentFailed: 'Payment failed, reason: {reason}',
+	}
+}