refactor: 完成多语言国际化全量替换与补充

1. 新增大量中英文语言包文件，覆盖自定义组件、页面、工具类的文案
2. 替换硬编码文本为多语言调用，统一全局文案管理
3. 优化语言包结构，拆分公共模块与业务模块
4. 修复部分语言加载与国际化适配问题

lang/en-us/order/invoice.js

@@ -0,0 +1,91 @@
+export const lang = {
+	//title for each page
+	title: 'Invoice Application',
+
+	// ====== Header ======
+	header: {
+		title: 'Invoice Information',
+		desc: 'Please fill in the invoice information'
+	},
+
+	// ====== Invoice Type ======
+	invoiceType: {
+		title: 'Invoice Type',
+		paper: 'Paper Invoice',
+		paperDesc: 'Invoice will be mailed to the specified address',
+		electronic: 'Electronic Invoice',
+		electronicDesc: 'Invoice will be sent to your email'
+	},
+
+	// ====== Invoice Title ======
+	invoiceTitle: {
+		title: 'Invoice Title',
+		personal: 'Personal',
+		company: 'Company',
+		label: 'Invoice Title',
+		personalPlaceholder: 'Please enter your name',
+		companyPlaceholder: 'Please enter company name',
+		taxpayerId: 'Taxpayer ID',
+		taxpayerIdPlaceholder: 'Please enter taxpayer ID'
+	},
+
+	// ====== Invoice Content ======
+	invoiceContent: {
+		title: 'Invoice Content',
+		label: 'Invoice Content',
+		placeholder: 'Please select invoice content'
+	},
+
+	// ====== Mail Info (Paper Invoice) ======
+	mailInfo: {
+		title: 'Mailing Information',
+		receiver: 'Recipient',
+		receiverPlaceholder: 'Please enter recipient name',
+		mobile: 'Contact Phone',
+		mobilePlaceholder: 'Please enter phone number',
+		address: 'Mailing Address',
+		regionPlaceholder: 'Please select region',
+		detailAddress: 'Detailed Address',
+		detailAddressPlaceholder: 'Please enter detailed address'
+	},
+
+	// ====== Email Info (Electronic Invoice) ======
+	emailInfo: {
+		title: 'Email Information',
+		receiverEmail: 'Receiver Email',
+		emailPlaceholder: 'Please enter the email address to receive the invoice'
+	},
+
+	// ====== Fee Section ======
+	fee: {
+		taxFee: 'Invoice Tax',
+		deliveryFee: 'Delivery Fee'
+	},
+
+	// ====== Footer Submit Section ======
+	footer: {
+		tip: 'Tip: Invoice applications will be processed within {days} working days',
+		submit: 'Submit Application'
+	},
+
+	// ====== Form Validation Messages ======
+	validation: {
+		pleaseEnterTitle: 'Please enter invoice title',
+		pleaseEnterTaxpayerId: 'Please enter taxpayer ID',
+		pleaseSelectContent: 'Please select invoice content',
+		pleaseEnterReceiver: 'Please enter recipient name',
+		pleaseEnterMobile: 'Please enter phone number',
+		pleaseSelectRegion: 'Please select region',
+		pleaseEnterAddress: 'Please enter detailed address',
+		pleaseEnterEmail: 'Please enter receiver email',
+		invalidEmail: 'Please enter a valid email address'
+	},
+
+	// ====== API Messages ======
+	api: {
+		getConfigFailed: 'Failed to get invoice configuration',
+		submitSuccess: 'Invoice application submitted successfully',
+		submitFailed: 'Submission failed, please try again later',
+		networkError: 'Network error, please try again later'
+	}
+}