feat: comprehensive SEO — meta tags, OG, Twitter cards, JSON-LD, sitemap, robots, llms.txt

Adds metadataBase, full OpenGraph + Twitter card tags, keywords,
JSON-LD structured data (SoftwareApplication + Organization),
sitemap.ts, robots.ts with AI crawler directives, and llms.txt
for AI agent discoverability.

apps/web/src/app/page.tsx

@@ -20,6 +20,43 @@ import {
 export default function HomePage() {
   return (
     <div className="min-h-screen bg-neutral-950">
+      <script
+        type="application/ld+json"
+        dangerouslySetInnerHTML={{
+          __html: JSON.stringify({
+            "@context": "https://schema.org",
+            "@type": "SoftwareApplication",
+            name: "AgentLens",
+            applicationCategory: "DeveloperApplication",
+            operatingSystem: "Web",
+            url: "https://agentlens.vectry.tech",
+            description:
+              "Open-source agent observability platform that traces AI agent decisions, not just API calls.",
+            offers: { "@type": "Offer", price: "0", priceCurrency: "USD" },
+            featureList: [
+              "Agent Decision Tracing",
+              "Real-time Dashboard",
+              "OpenAI Integration",
+              "LangChain Integration",
+              "Self-hosting Support",
+              "Python SDK",
+            ],
+          }),
+        }}
+      />
+      <script
+        type="application/ld+json"
+        dangerouslySetInnerHTML={{
+          __html: JSON.stringify({
+            "@context": "https://schema.org",
+            "@type": "Organization",
+            name: "Vectry",
+            url: "https://vectry.tech",
+            logo: "https://vectry.tech/static/img/logo-icon.png",
+            sameAs: ["https://gitea.repi.fun/repi/agentlens"],
+          }),
+        }}
+      />
       {/* Hero Section */}
       <section className="relative overflow-hidden border-b border-neutral-800/50">
         <div className="absolute inset-0 bg-gradient-to-b from-emerald-500/5 via-transparent to-transparent" />