feat(seo): 完成高级 SEO 优化配置

## 概述

完成 GitHub Pages 站点的 SEO 优化配置，解决根目录 404 问题并实现多语言 SEO 最佳实践。

## 主要变更

### 文档结构重组
- 中文版作为根目录（解决根目录 404 问题）
- 英文版移至 `/en/` 子目录

### SEO 优化
- ✅ 添加 hreflang 标签（zh-CN, en-US, x-default）
- ✅ 配置 sitemap.xml 生成（包含正确的 base path）
- ✅ 添加 robots.txt 文件
- ✅ 为中英文首页添加 JSON-LD 结构化数据（SoftwareSourceCode schema）

### 文档优化
- 更新描述为更自然的表达方式

## 测试计划

- [ ] 本地构建验证通过
- [ ] 本地预览验证 SEO 元素正确
- [ ] CI/CD 检查通过
- [ ] 部署后验证页面可访问

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Author: piratf

docs/.vitepress/config.mjs

@@ -1,30 +1,59 @@
 import { defineConfig } from 'vitepress'
 
 export default defineConfig({
-  title: 'Windows Folder Remark Tool',
-  description: 'A lightweight CLI tool to add remarks/comments to Windows folders via Desktop.ini',
+  title: 'Windows 文件夹备注工具',
+  description: '一个轻量级的命令行工具，通过 Desktop.ini 为 Windows 文件夹添加备注/评论。无系统驻留，无数据上传，安全放心，用完即走。',
   base: '/windows-folder-remark/',
-  lang: 'en-US',
+  lang: 'zh-CN',
 
   locales: {
     root: {
-      label: 'English',
-      lang: 'en-US'
-    },
-    zh: {
       label: '简体中文',
-      lang: 'zh-CN',
-      link: '/zh/'
+      lang: 'zh-CN'
+    },
+    en: {
+      label: 'English',
+      lang: 'en-US',
+      link: '/en/'
+    }
+  },
+
+  head: [
+    ['link', { rel: 'alternate', hreflang: 'zh-CN', href: 'https://piratf.github.io/windows-folder-remark/' }],
+    ['link', { rel: 'alternate', hreflang: 'en-US', href: 'https://piratf.github.io/windows-folder-remark/en/' }],
+    ['link', { rel: 'alternate', hreflang: 'x-default', href: 'https://piratf.github.io/windows-folder-remark/en/' }]
+  ],
+
+  sitemap: {
+    hostname: 'https://piratf.github.io',
+    transformItems(items) {
+      return items.map((item) => {
+        return {
+          url: '/windows-folder-remark' + (item.url.startsWith('/') ? '' : '/') + item.url,
+          changefreq: 'weekly',
+        }
+      })
     }
   },
 
   themeConfig: {
     nav: () => [
-      { text: 'Guide', link: '/en/guide/' },
-      { text: '中文', link: '/zh/' }
+      { text: '指南', link: '/guide/' },
+      { text: 'English', link: '/en/' }
     ],
 
     sidebar: {
+      '/': [
+        {
+          text: '指南',
+          items: [
+            { text: '介绍', link: '/' },
+            { text: '快速开始', link: '/guide/getting-started' },
+            { text: '使用方法', link: '/guide/usage' },
+            { text: 'API 参考', link: '/guide/api' }
+          ]
+        }
+      ],
       '/en/': [
         {
           text: 'Guide',
@@ -35,17 +64,6 @@ export default defineConfig({
             { text: 'API Reference', link: '/en/guide/api' }
           ]
         }
-      ],
-      '/zh/': [
-        {
-          text: '指南',
-          items: [
-            { text: '介绍', link: '/zh/' },
-            { text: '快速开始', link: '/zh/guide/getting-started' },
-            { text: '使用方法', link: '/zh/guide/usage' },
-            { text: 'API 参考', link: '/zh/guide/api' }
-          ]
-        }
       ]
     }
   }

docs/en/index.md

@@ -1,14 +1,35 @@
 ---
 layout: home
 
+head:
+  - - script
+    - type: application/ld+json
+    - |
+      {
+        "@context": "https://schema.org",
+        "@type": "SoftwareSourceCode",
+        "name": "Windows Folder Remark Tool",
+        "description": "A lightweight CLI tool to add remarks/comments to Windows folders via Desktop.ini. No system residency, no data upload, safe and secure, use it when you need it.",
+        "programmingLanguage": "Python",
+        "codeRepository": "https://github.com/piratf/windows-folder-remark",
+        "url": "https://piratf.github.io/windows-folder-remark/en/",
+        "version": "2.0.6",
+        "license": "MIT",
+        "offers": {
+          "@type": "Offer",
+          "price": "0",
+          "priceCurrency": "USD"
+        }
+      }
+
 hero:
   name: Windows Folder Remark Tool
   text: A Lightweight CLI Tool for Windows Folder Remarks
   tagline: Add remarks/comments to Windows folders via Desktop.ini
   actions:
     - theme: brand
       text: Get Started
-      link: /en/guide/getting-started
+      link: /guide/getting-started
     - theme: alt
       text: GitHub
       link: https://github.com/piratf/windows-folder-remark

docs/zh/guide/api.md docs/guide/api.mddocs/zh/guide/api.md renamed to docs/guide/api.md

@@ -1,14 +1,35 @@
 ---
 layout: home
 
+head:
+  - - script
+    - type: application/ld+json
+    - |
+      {
+        "@context": "https://schema.org",
+        "@type": "SoftwareSourceCode",
+        "name": "Windows 文件夹备注工具",
+        "description": "一个轻量级的命令行工具，通过 Desktop.ini 为 Windows 文件夹添加备注/评论。无系统驻留，无数据上传，安全放心，用完即走。",
+        "programmingLanguage": "Python",
+        "codeRepository": "https://github.com/piratf/windows-folder-remark",
+        "url": "https://piratf.github.io/windows-folder-remark/",
+        "version": "2.0.6",
+        "license": "MIT",
+        "offers": {
+          "@type": "Offer",
+          "price": "0",
+          "priceCurrency": "USD"
+        }
+      }
+
 hero:
-  name: Windows Folder Remark Tool
+  name: Windows 文件夹备注工具
   text: 轻量级 Windows 文件夹备注工具
   tagline: 通过 Desktop.ini 为 Windows 文件夹添加备注/评论
   actions:
     - theme: brand
       text: 快速开始
-      link: /zh/guide/getting-started
+      link: /guide/getting-started
     - theme: alt
       text: GitHub
       link: https://github.com/piratf/windows-folder-remark

docs/zh/guide/getting-started.md docs/guide/getting-started.mddocs/zh/guide/getting-started.md renamed to docs/guide/getting-started.md

@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://piratf.github.io/windows-folder-remark/sitemap.xml