feat(phase-2): SEO structured data, dynamic meta, service detail pages

- index.html: JSON-LD Organization + Services ItemList schema, Plausible
  Analytics, canonical link
- app.jsx: dynamic document.title + meta description/OG per hash route;
  service detail routing (services/:id → ServiceDetailPage)
- pages.jsx: ServiceDetailPage with hero, metric, use cases (3 per
  service), process timeline, highlights, and CTA; registered on window

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -2,3 +2,5 @@
 Thumbs.db
 *.log
 node_modules/
+
+.vercel