chore: import upstream snapshot with attribution

apps/docs/app/llms.txt/route.ts

@@ -0,0 +1,88 @@
+import { source } from '@/lib/source'
+import { DOCS_BASE_URL } from '@/lib/urls'
+
+export const revalidate = false
+
+export async function GET() {
+  const baseUrl = DOCS_BASE_URL
+
+  try {
+    const pages = source.getPages().filter((page) => {
+      if (!page || !page.data || !page.url) return false
+
+      const pathParts = page.url.split('/').filter(Boolean)
+      const hasLangPrefix = pathParts[0] && ['es', 'fr', 'de', 'ja', 'zh'].includes(pathParts[0])
+
+      return !hasLangPrefix
+    })
+
+    const sections: Record<string, Array<{ title: string; url: string; description?: string }>> = {}
+
+    pages.forEach((page) => {
+      const pathParts = page.url.split('/').filter(Boolean)
+      const section =
+        pathParts[0] && ['en', 'es', 'fr', 'de', 'ja', 'zh'].includes(pathParts[0])
+          ? pathParts[1] || 'root'
+          : pathParts[0] || 'root'
+
+      if (!sections[section]) {
+        sections[section] = []
+      }
+
+      sections[section].push({
+        title: page.data.title || 'Untitled',
+        url: `${baseUrl}${page.url}`,
+        description: page.data.description,
+      })
+    })
+
+    const manifest = `# Sim Documentation
+
+> The open-source AI workspace where teams build, deploy, and manage AI agents.
+
+Sim is the open-source AI workspace where teams build, deploy, and manage AI agents. Connect 1,000+ integrations and every major LLM to create agents that automate real work — visually, conversationally, or with code. Trusted by over 100,000 builders.
+
+## Documentation Overview
+
+This file provides an overview of our documentation. For full content of all pages, see [llms-full.txt](${baseUrl}/llms-full.txt).
+
+## Main Sections
+
+${Object.entries(sections)
+  .map(([section, items]) => {
+    const sectionTitle = section
+      .split('-')
+      .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+      .join(' ')
+    return `### ${sectionTitle}\n\n${items.map((item) => `- [${item.title}](${item.url})${item.description ? `\n  ${item.description}` : ''}`).join('\n')}`
+  })
+  .join('\n\n')}
+
+## Additional Resources
+
+- [Full documentation content](${baseUrl}/llms-full.txt)
+- Individual page content: ${baseUrl}/llms.mdx/[page-path]
+- [API documentation](${baseUrl}/api-reference/)
+- [Tool integrations](${baseUrl}/tools/)
+
+## Statistics
+
+- Total pages: ${pages.length} (English only)
+- Other languages available at: ${baseUrl}/[lang]/ (es, fr, de, ja, zh)
+
+---
+
+Generated: ${new Date().toISOString()}
+Format: llms.txt v0.1.0
+See: https://llmstxt.org for specification`
+
+    return new Response(manifest, {
+      headers: {
+        'Content-Type': 'text/plain; charset=utf-8',
+      },
+    })
+  } catch (error) {
+    console.error('Error generating LLM manifest:', error)
+    return new Response('Error generating documentation manifest', { status: 500 })
+  }
+}