feat(i18n): enhance locale handling and routing (#996)

* feat(i18n): enhance locale handling and routing

- Implemented dynamic locale aliases in router configuration.
- Added support for preferred locale storage in global state.
- Improved locale resolution logic in router beforeEach guard.
- Created utility functions for locale management and path manipulation.
- Added tests for locale matching and message extraction.
- Updated Header component to allow language selection.
- Refactored getRouterPathWithLang to utilize new locale utilities.
- Updated Vite configuration to support aliasing for vue-i18n.
- Bumped version numbers across various packages to 1.9.0.

* feat(i18n): update version to 1.8.0 and enhance locale handling

- Updated version numbers across all package.json files to 1.8.0.
- Enhanced locale handling in App.vue by centralizing locale configurations.
- Improved Turnstile component to support dynamic language rendering.
- Refactored i18n utilities to include initial locale setup and empty locale messages.
- Updated i18n.ts to utilize the new locale management structure.
- Added naive-locale.ts for better integration with Naive UI's locale handling.
- Adjusted Header.vue to streamline language selection and locale changes.
- Fixed translations in multiple locale files for consistency and accuracy.

* fix(i18n): address review feedback

* feat(i18n): update default locale to English and enhance language handling in components

* fix(i18n): switch locale selector to dropdown

* docs: add topbar language and github order design spec

* fix(i18n): 修复 Header 语言切换器相关问题，恢复为独立控件并调整样式

* Refactor locale handling in router and add locale-guard utility functions

- Improved locale resolution logic in router by introducing utility functions for better readability and maintainability.
- Added `locale-guard.js` to encapsulate locale-related functions such as getting route locale, resolving locale for navigation, and applying locale navigation state.
- Updated JWT synchronization logic to streamline the handling of JWT from query parameters.
- Modified i18n messages test to check for coverage of registered locale message keys instead of extracting English source messages.

* 删除顶部栏语言和GitHub顺序设计文档

* fix: 修复前端设置初始化时未返回 domains 数组导致的 undefined 错误

* refactor(i18n): consolidate locale infrastructure

* fix(i18n): stabilize locale route switching

* fix(i18n): persist default locale selection

* fix(i18n): 修复前端设置初始化时未返回 domains 数组导致的 undefined 错误，统一按空数组兜底处理
feat(i18n): 添加 locale 别名处理，支持默认语言的重定向
test(i18n): 增加对默认语言别名重定向的测试用例

* refactor: replace useAppI18n with useScopedI18n in multiple components for improved localization management

* fix(tests): 移除不必要的 URL 断言以简化 Passkey 测试

* fix(i18n): 更新语言切换逻辑，确保使用当前语言设置进行路由导航

* fix(i18n): 强制路由切换以确保语言切换后正确导航

* refactor(i18n): 优化消息注册和路由本地化逻辑，移除冗余代码

* refactor(i18n): 拆分 API 文件以优化路由管理，更新语言处理逻辑

* fix: align i18n release notes and frontend test script

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ### Features
 
+- feat: |Frontend| 前端新增 6 国语言支持（`zh` / `en` / `es` / `pt-BR` / `ja` / `de`），默认语言保持为 `zh`；无 locale 前缀路由（如 `/`、`/user`）默认使用中文渲染，同时会记录浏览器语言作为语言偏好。用户手动切换后会持久化语言偏好，并保持当前页面路径、查询参数与 canonical locale URL 一致
 - feat: |API| 新增服务端解析邮件接口 `/api/parsed_mails` 与 `/api/parsed_mail/:id`，直接返回 `sender` / `subject` / `text` / `html` / `attachments` 元信息（复用 `commonParseMail`），AI agent 侧不再需要引入 MIME 解析器
 - feat: |Skill| 新增仓库内置只读 skill `cf-temp-mail-agent-mail`（`skills/cf-temp-mail-agent-mail/`），让 OpenClaw / Codex / Cursor 等 AI agent 凭用户提供的 Address JWT + API 地址读取邮箱、轮询验证码，绕开创建邮箱时的 Turnstile 人机验证；可通过 `npx degit dreamhunter2333/cloudflare_temp_email/skills/cf-temp-mail-agent-mail` 安装
 - docs: |文档| 新增"AI Agent 使用邮箱"文档（`guide/feature/agent-email`），说明 `parsed_mail` API 用法，并在 parsed API 不可用时给出对齐前端的 `mail-parser-wasm` + `postal-mime` 本地解析回退方案