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/detail.js

@@ -34,6 +34,83 @@ export const lang = {
 	
 	kefu:'Contact',
 	follow:'Follow',
-	
-	spec:'Spec'
-} 
+
+	spec:'Spec',
+
+	// SKU related
+	stockInsufficient: 'Insufficient stock',
+	offShelves: 'This product has been removed',
+	soldOut: 'Sold out',
+	buyCountNotZero: 'Purchase quantity cannot be less than or equal to 0',
+	stockLessThanMinBuy: 'Stock is less than minimum purchase quantity',
+	purchaseLimit: 'Limit {count} {unit} per person',
+	purchaseLimitWithPurchased: 'Limit {count} {unit} per person, you have purchased {purchased} {unit}',
+	maxPurchasePerTime: 'Maximum purchase of {count} {unit} per time',
+	selectedSpec: 'Selected: ',
+	buyCount: 'Purchase Quantity',
+	exchangeCount: 'Exchange Quantity',
+	joinCart: 'Add to Cart',
+	confirmBtn: 'Confirm',
+	rushBuy: 'Buy Now',
+	exchangeBtn: 'Exchange',
+	addToCartSuccess: 'Added to cart successfully',
+	minBuyStart: 'Minimum order: {minBuy} {unit}',
+	balanceLabel: 'Balance',
+	pointLabel: 'Points: ',
+	stockLabel: 'Stock: ',
+	groupOfNum: '{num}-person group',
+	limitPerPerson: 'Limit: {count} {unit}/person',
+	limitBuyRange: 'From {minBuy} {unit}, limit {maxBuy} {unit}',
+	limitBuyMax: 'Limit: {maxBuy} {unit}',
+	previewCannotBuy: 'Preview products cannot be purchased',
+	specNotInBale: 'This spec is not in the bale activity',
+	goodsStockInsufficient: 'Insufficient product stock',
+	goodsAddCartSuccess: 'Product added to cart successfully',
+	selected: 'Selected: ',
+	startingNum: 'Min. order: {num} pcs',
+	goodsOffShelves: 'Product has been removed',
+
+	// Price & Promotion
+	limitedTimeDiscount: 'Limited Time Discount',
+	sold: 'Sold',
+	countdownEndsIn: 'Ends In',
+	originalPrice: 'Original Price',
+
+	// Combo Package
+	comboPackage: 'Combo Package',
+	comboPrice: 'Combo Price',
+
+	// Coupons
+	coupons: 'Coupons',
+	discountOff: '% off',
+	minSpendAvailable: 'Min. spend {amount}',
+	noThreshold: 'No threshold',
+	maxDiscount: 'Max discount: {symbol}{amount}',
+	validUntilDate: 'Valid until: {date}',
+	validForDays: 'Valid for {days} days after claiming',
+	validPermanent: 'Valid: Permanent',
+	couponSoldOut: 'Sold out',
+	couponClaimed: 'Claimed',
+	couponReceive: 'Claim',
+
+	// Promotions
+	promotion: 'Promotion',
+	fullReduction: 'Full Reduction',
+	fullGift: 'Full Gift',
+	freeShipping: 'Free Shipping',
+
+	// Product Message
+	productMessage: 'Product Message',
+
+	// AI Customer Service
+	aiCustomerService: 'AI Assistant',
+
+	// Contact Popup
+	dialOnMobile: 'Dial {phone} on mobile',
+	cancel: 'Cancel',
+	copyToClipboard: 'Copy to Clipboard',
+	copySuccess: 'Copied successfully',
+
+	// Common Button
+	confirm: 'Confirm',
+}