c0py: initial scaffolding for website registry tool

apps/web/src/app/page.tsx

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+// Placeholder - Next.js app router entry
+export default function Home() {
+  return <div>c0py</div>;
+}

apps/web/src/env.d.ts

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+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+
+// NEXT_PUBLIC_* prefixed env vars are inlined at build time
+// No secret values should use NEXT_PUBLIC_ prefix