feat(plugin-i18n): language detection

[caohuilin]

Summary

增强 Modern.js i18n 插件的语言检测功能，实现了服务端渲染(SSR)和客户端渲染(CSR)的语言一致性：

主要改动：

1. SSR 语言数据传递机制
   • 在服务端检测到的语言通过 exportServerLngToWindow 函数存储到 runtimeContext.i18nData
   • 在 plugin-runtime 中将 i18n 数据包含在 SSR 数据中传递给客户端
   • 客户端优先使用 SSR 传递的语言数据，避免 hydration 不匹配
2. 语言检测优先级重构
   • 新的检测优先级：SSR 数据 > 路径检测 > i18next 检测器 > 回退语言
   • 优化了路径检测逻辑，支持从 URL 路径中提取语言信息
   • 改进了检测选项合并逻辑，避免路径检测冲突
3. 代码结构优化
   • 将语言检测相关功能模块化，分离到独立的文件中
   • 统一了浏览器端和 Node.js 端的检测接口
   • 增强了类型安全性

English Version

This change enhances the Modern.js i18n plugin's language detection functionality, achieving
consistency between Server-Side Rendering (SSR) and Client-Side Rendering (CSR):

Key Changes:

1. SSR Language Data Transfer Mechanism
   • Server-detected language is stored in runtimeContext.i18nData via exportServerLngToWindow
     function
   • i18n data is included in SSR data and passed to client-side in plugin-runtime
   • Client-side prioritizes SSR-transferred language data to avoid hydration mismatch
2. Language Detection Priority Refactoring
   • New detection priority: SSR data > Path detection > i18next detector > Fallback language
   • Optimized path detection logic to extract language information from URL paths
   • Improved detection options merging logic to avoid path detection conflicts
3. Code Structure Optimization
   • Modularized language detection functionality into separate files
   • Unified detection interfaces for browser and Node.js environments
   • Enhanced type safety

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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