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/(marketing)/privacy/page.tsx

@@ -1,4 +1,11 @@
-export const metadata = { title: 'Privacy — BuildMyMCPServer' };
+import { pageMetadata } from '@/lib/seo';
+
+export const metadata = pageMetadata({
+  title: 'Privacy',
+  description:
+    'BuildMyMCPServer privacy policy — what data we collect, how it is used, and the rights you have over it.',
+  path: '/privacy',
+});
 
 const SECTIONS = [
   {
@@ -29,7 +36,7 @@ const SECTIONS = [
   {
     h: 'Subprocessors',
     p: [
-      'Anthropic (generation) — only the prompt text you send. Anthropic\'s data-retention policy applies.',
+      "Anthropic (generation) — only the prompt text you send. Anthropic's data-retention policy applies.",
       'Hetzner (compute).',
       'Backblaze (encrypted backups).',
       'Stripe (billing).',
@@ -91,7 +98,10 @@ export default function Privacy() {
           <h2 className="text-[16px] font-semibold tracking-tight">Contact</h2>
           <p className="mt-3 text-[13.5px] leading-relaxed text-[--color-fg-muted]">
             Data controller: BuildMyMCPServer. Email{' '}
-            <a className="text-[--color-accent] underline" href="mailto:privacy@buildmymcpserver.com">
+            <a
+              className="text-[--color-accent] underline"
+              href="mailto:privacy@buildmymcpserver.com"
+            >
               privacy@buildmymcpserver.com
             </a>{' '}
             for any of the above.