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/member/coupon.js

@@ -1,4 +1,47 @@
 export const lang = {
-	//title为每个页面的标题
-	title: 'My Coupons'
-}
+	//title is the title of each page
+	title: 'My Coupons',
+	// ====== Tabs ======
+	// Unused
+	tabUnused: 'Unused',
+	// Used
+	tabUsed: 'Used',
+	// Expired
+	tabExpired: 'Expired',
+
+	// ====== Coupon Info ======
+	// Discount display: {discount}% off
+	discountText: '{discount}% off',
+	// Minimum amount condition: Available with {amount} yuan spend
+	minAmountCondition: 'Min. {amount} available',
+	// No threshold coupon
+	noThresholdCoupon: 'No threshold coupon',
+	// Specified goods
+	specifiedGoods: 'Specified goods',
+	// Maximum discount: (Max discount {amount} yuan)
+	maxDiscount: '(Max discount {amount})',
+
+	// ====== Valid Period ======
+	// Valid period prefix
+	validPeriodPrefix: 'Valid: ',
+	// Long-term valid
+	longTermValid: 'Long-term valid',
+
+	// ====== Buttons & Status ======
+	// Use now
+	useNow: 'Use Now',
+	// Used
+	used: 'Used',
+	// Expired
+	expired: 'Expired',
+
+	// ====== Empty State ======
+	// No coupons yet
+	emptyText: 'No coupons yet',
+	// Go shopping
+	goShopping: 'Go Shopping',
+
+	// ====== Toast Messages ======
+	// Merchant has not enabled coupons
+	merchantNotEnabled: 'Merchant has not enabled coupons'
+}