feat: 新增SEO基础功能 (robots.txt, sitemap.xml, 404页面)

- 新增 robots.ts 生成搜索引擎爬虫指令
- 新增 sitemap.ts 动态生成站点地图（含所有项目页面）
- 新增自定义 404 页面，支持中英文
- 新增 catchAll 路由捕获未匹配路径
- 更新翻译文件添加 404 页面文案

src/app/[locale]/[...catchAll]/page.tsx

@@ -0,0 +1,5 @@
+import { notFound } from 'next/navigation'
+
+export default function CatchAllPage() {
+  notFound()
+}

src/app/[locale]/not-found.tsx

@@ -0,0 +1,32 @@
+import Link from 'next/link'
+import { getTranslations } from 'next-intl/server'
+
+export default async function NotFound() {
+  const t = await getTranslations('notFound')
+
+  return (
+    <div className="min-h-[60vh] flex flex-col items-center justify-center px-4">
+      <h1 className="text-6xl font-bold text-primary mb-4">404</h1>
+      <p className="text-xl text-gray-600 dark:text-gray-400 mb-8">
+        {t('title')}
+      </p>
+      <p className="text-gray-500 dark:text-gray-500 mb-8 text-center max-w-md">
+        {t('description')}
+      </p>
+      <div className="flex gap-4">
+        <Link
+          href="/"
+          className="px-6 py-3 bg-primary text-black font-medium hover:bg-primary/90 transition-colors"
+        >
+          {t('backHome')}
+        </Link>
+        <Link
+          href="/projects"
+          className="px-6 py-3 border-2 border-primary text-primary font-medium hover:bg-primary/10 transition-colors"
+        >
+          {t('browseProjects')}
+        </Link>
+      </div>
+    </div>
+  )
+}

src/app/robots.ts

@@ -0,0 +1,16 @@
+import { MetadataRoute } from 'next'
+
+export default function robots(): MetadataRoute.Robots {
+  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://agentpark.ai'
+
+  return {
+    rules: [
+      {
+        userAgent: '*',
+        allow: '/',
+        disallow: ['/api/', '/private/'],
+      },
+    ],
+    sitemap: `${baseUrl}/sitemap.xml`,
+  }
+}

src/app/sitemap.ts

@@ -0,0 +1,55 @@
+import { MetadataRoute } from 'next'
+import { getProjects } from '@/hooks/useProjects'
+
+export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
+  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://agentpark.ai'
+
+  // 获取所有项目
+  const { projects } = await getProjects({ limit: 1000 })
+
+  // 静态页面
+  const staticPages: MetadataRoute.Sitemap = [
+    {
+      url: `${baseUrl}/zh`,
+      lastModified: new Date(),
+      changeFrequency: 'daily',
+      priority: 1,
+    },
+    {
+      url: `${baseUrl}/en`,
+      lastModified: new Date(),
+      changeFrequency: 'daily',
+      priority: 1,
+    },
+    {
+      url: `${baseUrl}/zh/projects`,
+      lastModified: new Date(),
+      changeFrequency: 'daily',
+      priority: 0.9,
+    },
+    {
+      url: `${baseUrl}/en/projects`,
+      lastModified: new Date(),
+      changeFrequency: 'daily',
+      priority: 0.9,
+    },
+  ]
+
+  // 项目详情页（中英文）
+  const projectPages: MetadataRoute.Sitemap = projects.flatMap((project) => [
+    {
+      url: `${baseUrl}/zh/projects/${project.slug}`,
+      lastModified: project.updatedAt,
+      changeFrequency: 'weekly' as const,
+      priority: 0.8,
+    },
+    {
+      url: `${baseUrl}/en/projects/${project.slug}`,
+      lastModified: project.updatedAt,
+      changeFrequency: 'weekly' as const,
+      priority: 0.8,
+    },
+  ])
+
+  return [...staticPages, ...projectPages]
+}

src/messages/en.json

@@ -36,7 +36,31 @@
     "browseByTagsSection": "BROWSE BY TAGS",
     "featuredProjectsSection": "FEATURED PROJECTS",
     "viewAll": "VIEW ALL",
-    "viewAllProjects": "VIEW ALL PROJECTS"
+    "viewAllProjects": "VIEW ALL PROJECTS",
+    "insightsSection": "Site Overview",
+    "statsTotalProjects": "Total Projects",
+    "statsActiveProjects": "Active Projects",
+    "statsArchivedProjects": "Archived Projects",
+    "statsTotalTags": "Total Tags",
+    "statsNewProjects7d": "New in 7 Days",
+    "rankingsSection": "Project Rankings",
+    "latestRankingTitle": "Latest Additions",
+    "starsRankingTitle": "GitHub Stars Ranking",
+    "window24h": "24H",
+    "window7d": "7D",
+    "window30d": "30D",
+    "noLatestProjects": "No new projects in this time window",
+    "noStarsProjects": "No stars data available",
+    "viewAllLatest": "View all latest projects",
+    "viewAllByStars": "View all by stars",
+    "tagInsightsSection": "Tag Popularity & Distribution",
+    "topTagsTitle": "Top Tags",
+    "categoryDistributionTitle": "Category Distribution",
+    "tagsUnit": "tags",
+    "projectsUnit": "projects",
+    "noTagData": "No tag metrics available",
+    "recentTimelineSection": "Recent Additions Timeline",
+    "noTimelineProjects": "No recent additions yet"
   },
   "project": {
     "backToProjects": "BACK TO PROJECTS",
@@ -104,6 +128,12 @@
     "about": "About",
     "submitProject": "SUBMIT PROJECT"
   },
+  "notFound": {
+    "title": "Page Not Found",
+    "description": "Sorry, the page you're looking for doesn't exist or has been moved.",
+    "backHome": "Back to Home",
+    "browseProjects": "Browse Projects"
+  },
   "layout": {
     "announcement": "DISCOVER THE FUTURE OF AI AGENTS",
     "announcementHref": "/projects",

src/messages/zh.json

@@ -36,7 +36,31 @@
     "browseByTagsSection": "按标签浏览",
     "featuredProjectsSection": "精选项目",
     "viewAll": "查看全部",
-    "viewAllProjects": "查看全部项目"
+    "viewAllProjects": "查看全部项目",
+    "insightsSection": "站点概览",
+    "statsTotalProjects": "项目总数",
+    "statsActiveProjects": "活跃项目",
+    "statsArchivedProjects": "归档项目",
+    "statsTotalTags": "标签总数",
+    "statsNewProjects7d": "近7天新增",
+    "rankingsSection": "项目榜单",
+    "latestRankingTitle": "最新入库榜",
+    "starsRankingTitle": "GitHub Stars 榜",
+    "window24h": "24小时",
+    "window7d": "7天",
+    "window30d": "30天",
+    "noLatestProjects": "该时间窗口暂无新增项目",
+    "noStarsProjects": "暂无可展示的 Stars 数据",
+    "viewAllLatest": "查看全部最新项目",
+    "viewAllByStars": "查看全部 Stars 排序",
+    "tagInsightsSection": "标签热度与分布",
+    "topTagsTitle": "热门标签",
+    "categoryDistributionTitle": "分类分布",
+    "tagsUnit": "个标签",
+    "projectsUnit": "个项目",
+    "noTagData": "暂无标签统计数据",
+    "recentTimelineSection": "最近新增时间线",
+    "noTimelineProjects": "暂无最近新增项目"
   },
   "project": {
     "backToProjects": "返回项目列表",
@@ -104,6 +128,12 @@
     "about": "关于",
     "submitProject": "提交项目"
   },
+  "notFound": {
+    "title": "页面未找到",
+    "description": "抱歉，您访问的页面不存在或已被移除。",
+    "backHome": "返回首页",
+    "browseProjects": "浏览项目"
+  },
   "layout": {
     "announcement": "发现 AI 代理的未来",
     "announcementHref": "/projects",