feat(web): full SEO stack — metadata, JSON-LD, sitemap, robots, OG image

Ported and adapted from the BuildMyDiscord SEO setup:

- lib/seo.ts — single source for site constants, the FAQ data (shared by
  the rendered FAQ and the FAQPage schema so they never drift) and JSON-LD
  builders.
- Rich root metadata: title template, keywords, Open Graph, Twitter card,
  robots directives, canonical.
- JSON-LD: Organization + WebSite + SoftwareApplication sitewide, FAQPage
  on the landing page. No AggregateRating — there are no real reviews yet.
- app/robots.ts — allow all, explicit allow-list for AI answer-engine
  crawlers (GPTBot, ClaudeBot, PerplexityBot, …), disallow private routes.
- app/sitemap.ts — every public marketing + docs route.
- app/opengraph-image.tsx — monochrome on-brand 1200x630 share card.
- app/manifest.ts + public/llms.txt.
- Per-page metadata for pricing, changelog, security, privacy, terms,
  docs, templates and status.
- opengraph-image + apple-icon pinned to the edge runtime — next/og
  crashes during a Node-runtime prerender.

Verified: next build passes; /robots.txt, /sitemap.xml,
/manifest.webmanifest and /opengraph-image all generate.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/app/apple-icon.tsx

@@ -1,40 +1,37 @@
 import { ImageResponse } from 'next/og';
 
+// Edge runtime — see opengraph-image.tsx: avoids the next/og fileURLToPath
+// crash during a Node-runtime prerender (notably on Windows builds).
+export const runtime = 'edge';
+
 export const size = { width: 180, height: 180 };
 export const contentType = 'image/png';
 
 export default function AppleIcon() {
   return new ImageResponse(
-    (
-      <div
-        style={{
-          width: '100%',
-          height: '100%',
-          background: '#6366F1',
-          borderRadius: 38,
-          display: 'flex',
-          alignItems: 'center',
-          justifyContent: 'center',
-        }}
-      >
-        <svg
-          width="120"
-          height="120"
-          viewBox="0 0 32 32"
-          xmlns="http://www.w3.org/2000/svg"
-        >
-          <title>BuildMyMCPServer</title>
-          <path
-            d="M8.5 22.5V9.5L16 16L23.5 9.5V22.5"
-            stroke="#FFFFFF"
-            strokeWidth={2.4}
-            strokeLinecap="round"
-            strokeLinejoin="round"
-            fill="none"
-          />
-        </svg>
-      </div>
-    ),
+    <div
+      style={{
+        width: '100%',
+        height: '100%',
+        background: '#6366F1',
+        borderRadius: 38,
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+      }}
+    >
+      <svg width="120" height="120" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+        <title>BuildMyMCPServer</title>
+        <path
+          d="M8.5 22.5V9.5L16 16L23.5 9.5V22.5"
+          stroke="#FFFFFF"
+          strokeWidth={2.4}
+          strokeLinecap="round"
+          strokeLinejoin="round"
+          fill="none"
+        />
+      </svg>
+    </div>,
     { ...size },
   );
 }