feat: Add SEO/AEO/Geo improvements

- Add ai.txt and llms.txt endpoints for AI/LLM discoverability
- Enhance metadata across all pages (canonical URLs, OpenGraph, Twitter)
- Add structured data (JSON-LD) to blog index, tag pages
- Update robots.txt with AI crawler rules
- Improve BlogPosting and CollectionPage schemas

app/blog/[slug]/page.tsx

@@ -43,12 +43,21 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
   return {
     title: post.title,
     description: post.description || post.title,
+    authors: post.authors?.length ? post.authors.map(author => ({ name: author })) : [{ name: siteConfig.author }],
+    robots: {
+      index: true,
+      follow: true,
+      googleBot: {
+        index: true,
+        follow: true,
+      },
+    },
     openGraph: {
       title: post.title,
       description: post.description || post.title,
       type: 'article',
       publishedTime: post.published_at,
-      authors: post.authors,
+      authors: post.authors?.length ? post.authors : [siteConfig.author],
       tags: post.tags,
       images: [
         {
@@ -97,6 +106,11 @@ export default async function BlogPostPage({ params }: Props) {
     ? `${siteConfig.url}${post.feature_image.replace('../assets', '/assets')}`
     : ogImageUrl.toString();
 
+  // Estimate word count and reading time
+  const textContent = post.body?.raw || '';
+  const wordCount = textContent.split(/\s+/).filter(Boolean).length;
+  const readingTime = Math.ceil(wordCount / 200);
+
   // BlogPosting Schema
   const blogPostingSchema = {
     '@context': 'https://schema.org',
@@ -127,10 +141,30 @@ export default async function BlogPostPage({ params }: Props) {
       keywords: post.tags.join(', '),
       articleSection: post.tags[0],
     }),
+    ...(wordCount > 0 && {
+      wordCount: wordCount,
+      readingTime: `${readingTime} min read`,
+    }),
+    articleBody: textContent.slice(0, 5000),
     inLanguage: siteConfig.defaultLocale,
     url: postUrl,
   };
 
+  // Speakable Schema for AEO
+  const speakableSchema = {
+    '@context': 'https://schema.org',
+    '@type': 'SpeakableSpecification',
+    speakable: {
+      '@type': 'CSSSelector',
+      selector: [
+        'article[data-toc-content]',
+        '.prose h2',
+        '.prose h3',
+        '.prose p',
+      ],
+    },
+  };
+
   // BreadcrumbList Schema
   const breadcrumbSchema = {
     '@context': 'https://schema.org',
@@ -161,6 +195,7 @@ export default async function BlogPostPage({ params }: Props) {
     <>
       <JsonLd data={blogPostingSchema} />
       <JsonLd data={breadcrumbSchema} />
+      <JsonLd data={speakableSchema} />
       <ReadingProgress />
       <PostLayout hasToc={hasToc} contentKey={slug}>
         <div className="space-y-8">

app/blog/page.tsx

@@ -1,26 +1,62 @@
+import { Link } from 'next-view-transitions';
 import { getAllPostsSorted } from '@/lib/posts';
 import { PostListWithControls } from '@/components/post-list-with-controls';
 import { TimelineWrapper } from '@/components/timeline-wrapper';
 import { SidebarLayout } from '@/components/sidebar-layout';
+import { SectionDivider } from '@/components/section-divider';
+import { ScrollReveal } from '@/components/scroll-reveal';
+import { FiTrendingUp } from 'react-icons/fi';
+import { siteConfig } from '@/lib/config';
+import { JsonLd } from '@/components/json-ld';
 
 export const metadata = {
-  title: '所有文章'
+  title: '所有文章',
+  description: '瀏覽所有文章，持續更新中。',
+  alternates: {
+    canonical: `${siteConfig.url}/blog`
+  }
 };
 
 export default function BlogIndexPage() {
   const posts = getAllPostsSorted();
 
+  // Blog schema
+  const blogSchema = {
+    '@context': 'https://schema.org',
+    '@type': 'Blog',
+    name: '所有文章',
+    description: '瀏覽所有文章，持續更新中。',
+    url: `${siteConfig.url}/blog`,
+    inLanguage: siteConfig.defaultLocale,
+    blogPost: posts.slice(0, 10).map((post) => ({
+      '@type': 'BlogPosting',
+      headline: post.title,
+      url: `${siteConfig.url}${post.url}`,
+      datePublished: post.published_at,
+      dateModified: post.updated_at || post.published_at,
+      author: {
+        '@type': 'Person',
+        name: siteConfig.author
+      }
+    }))
+  };
+
   return (
     <section className="space-y-4">
+      <JsonLd data={blogSchema} />
       <SidebarLayout>
-        <header className="space-y-1">
-          <h1 className="type-title font-semibold text-slate-900 dark:text-slate-50">
-            所有文章
-          </h1>
-          <p className="type-small text-slate-500 dark:text-slate-400">
-            繼續往下滑，慢慢逛逛。
-          </p>
-        </header>
+        <SectionDivider>
+          <ScrollReveal>
+            <header className="space-y-1">
+              <h1 className="type-title font-semibold text-slate-900 dark:text-slate-50">
+                所有文章
+              </h1>
+              <p className="type-small text-slate-500 dark:text-slate-400">
+                繼續往下滑，慢慢逛逛。
+              </p>
+            </header>
+          </ScrollReveal>
+        </SectionDivider>
         <PostListWithControls posts={posts} />
       </SidebarLayout>
     </section>