feat: 新增多语言文案、优化导航及工具函数，修复部分业务逻辑

1. 新增多语言资源文件，覆盖文章、预约日期、会员信息、优惠券、表单、购物车、积分商城、分销、AI聊天等多个模块
2. 优化底部导航组件，使用多语言配置替代硬编码文案
3. 重构工具函数，新增从后端数据提取多语言文案的工具方法
4. 修复邀请好友页面的保存提示文案，替换为多语言版本
5. 修复商品SKU组件的提示文案，使用多语言配置
6. 重构AI聊天页面的帮助文档和回复模板，使用多语言配置
7. 优化空状态组件，支持多语言默认文案
8. 修复跳转逻辑，补全参数传递
9. 新增本地开发环境配置

lang/en-us/goods/cart.js

@@ -1,5 +1,5 @@
 export const lang = {
-	//title为每个页面的标题
+	//title is the title of each page
 	title: 'Shopping Cart',
 	complete: 'Complete',
 	edit: 'Manage',
@@ -9,5 +9,39 @@ export const lang = {
 	emptyTips: 'No products yet',
 	goForStroll: 'Go shopping',
 	del: 'Delete',
-	login: 'Go to login'
-}
+	login: 'Go to login',
+	// cart header
+	totalKinds: '{count} item(s)',
+	// coupon tips
+	coupon: 'Coupon',
+	couponMaxDiscount: 'Save up to {money} with coupons',
+	receive: 'Receive',
+	view: 'View',
+	clickToReceive: 'Click to receive',
+	clickToView: 'Click to view',
+	// full reduction
+	fullReduction: 'Full Reduction',
+	fullReductionItem: 'Spend {limit}, get {discount} off',
+	// invalid goods
+	invalidGoods: '{count} invalid item(s)',
+	clear: 'Clear',
+	invalid: 'Invalid',
+	// empty cart
+	cartEmpty: 'Shopping cart is empty',
+	cartEmptySubText: 'Go browse and find your favorite products',
+	// discount detail popup
+	discountDetail: 'Discount Details',
+	goodsTotal: 'Subtotal',
+	// coupon popup
+	discountLabel: 'off',
+	minSpend: 'Min. spend {amount}',
+	noThreshold: 'No threshold',
+	maxDiscount: 'Max discount {symbol}{limit}',
+	validityPeriod: 'Valid: ',
+	validFromReceive: 'Valid for {days} days from receipt',
+	longTermValid: 'Long-term valid',
+	received: 'Received',
+	// settlement button
+	receiveCouponSettle: 'Receive & Checkout ({count})',
+	settleImmediately: 'Checkout ({count})'
+}