Set up nextjs i18n support

[zshanhui]

Set up Next.js native i18n support by restructuring the app for locale-based routing, implementing middleware, and updating all pages and components for multi-language content delivery.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[zshanhui]

@cursoragent write some documentation in docs/i18n.md on to explain how this feature works. be precise and accurate.

[cursor]

Created i18n documentation at docs/i18n.md. It covers:

• Overview: locale-based routing with Next.js App Router
• Supported locales: en, es, zh (with en as default)
• Architecture: file structure and routing
• Middleware: locale detection and redirection logic
• Translation system: how to use translations in components
• Language switcher: how the component works
• Layout structure: root and locale-specific layouts
• Adding new translations: step-by-step guide
• Adding new locales: instructions for expansion
• Best practices: development guidelines
• Technical details: detection flow and translation loading
• Troubleshooting: common issues and solutions

The documentation is based on the current codebase and includes code examples and explanations of how the i18n feature works.

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中文摘要：

已在 docs/i18n.md 创建了 i18n 功能文档，涵盖：

• 概述和架构
• 支持的三种语言（en、es、zh）
• 中间件实现和语言检测策略
• 翻译系统的使用方法
• 语言切换器的工作原理
• 添加新翻译和语言的方法
• 最佳实践和故障排除指南

文档基于当前代码库，包含代码示例和详细说明。

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_{Learn more about Cursor Agents}

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}