feat: search metadata, structured data and indexing rules

Only the production deployment may be indexed; testing and preview builds
answer with noindex and a closed robots file. The homepage now describes the
person, the services and the FAQ as structured data, and title, description
and the 404 page are written for what people search for.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/components/home/HeroStatement.tsx

@@ -24,7 +24,7 @@ export const HeroStatement: React.FC = () => (
 
       <div className="mt-10 grid grid-cols-1 gap-10 md:mt-14 md:grid-cols-12 md:items-end md:gap-12">
         <p className="m-0 max-w-2xl font-sans text-xl leading-snug text-slate-500 md:col-span-7 md:text-3xl">
-          Freelance developer with 15 years of experience.{" "}
+          Freelance web developer with 15 years of experience.{" "}
           <span className="text-slate-900">
             I build web apps, interfaces and websites.
           </span>