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/member/cancellation.js

@@ -1,3 +1,6 @@
 export const lang = {
 	title: 'Account Cancellation',
-}
+	agreeTermsText: 'Check to indicate you have read and agree to this agreement',
+	nextStep: 'Next',
+	pleaseAgreeFirst: 'Please check to agree to the agreement first',
+}