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/common.js

@@ -28,6 +28,31 @@ export const lang = {
 		weChatWorkKefu: 'WeChat Work Customer Service',
 	},
 
+	// customer service module
+	customerService: {
+		openFailed: 'Failed to open customer service',
+		wxworkConfigIncomplete: 'WeChat Work configuration incomplete',
+		jumpFailed: 'Jump failed, please try again later',
+		miniProgramOnly: 'Third-party mini program customer service is only available in WeChat Mini Program',
+		linkCopied: 'Link copied, please open in browser',
+		customerLinkCopied: 'Customer service link copied',
+		noServicePhone: 'No customer service phone number',
+		getPhoneFailed: 'Failed to get customer service phone',
+		contactCustomerService: 'Contact Customer Service',
+		callServiceTip: 'Please contact customer service at {phone}',
+		noServiceOffline: 'Sorry, no customer service available, please contact offline',
+		configError: 'Customer Service Configuration Error',
+		configErrorDetail: 'Configuration errors:\n{errors}',
+		tip: 'Tip',
+		cannotAddWxwork: 'Cannot add WeChat Work directly, use other methods to contact customer service?',
+		onlineUnavailable: 'Online customer service unavailable, call customer service?',
+		developing: 'Customer service selection feature under development',
+		wxworkNotConfigured: 'WeChat Work customer service not configured',
+		serviceUnavailable: 'Customer service temporarily unavailable',
+		wxworkLinkNotConfigured: 'WeChat Work link not configured',
+		fromFloatButton: 'Inquiry from floating button',
+	},
+
 	getDynacode: 'Get Code',
 
 	login: 'Login/Register',