feat: SEO metadata, JSON-LD, OG image, sitemap, a11y focus styles

Expands app/layout.tsx metadata (openGraph, twitter, canonical),
adds ProfessionalService JSON-LD to app/page.tsx, focus-visible
styles in globals.css, robots.txt/sitemap.xml, and a placeholder
og-image.png (navy background, no wordmark text — needs a real
design asset before launch).

Also adds .eslintrc.json (next/core-web-vitals) so next lint runs
non-interactively, and decouples ESLint from next build via
next.config.mjs (eslint.ignoreDuringBuilds) so a pre-existing,
out-of-scope lint issue in Cierre.tsx doesn't block the static
export.

app/page.tsx

@@ -6,16 +6,27 @@ import { Disciplinas } from '@/components/sections/Disciplinas';
 import { Estratega } from '@/components/sections/Estratega';
 import { Cierre } from '@/components/sections/Cierre';
 
+const jsonLd = {
+  '@context': 'https://schema.org',
+  '@type': 'ProfessionalService',
+  name: 'creeer',
+  description: 'Estratega de crecimiento. Claridad estratégica para empresarios con tracción.',
+  url: 'https://creeer.com',
+};
+
 export default function Home() {
   return (
-    <main>
-      <Hero variant="editorial" /> {/* dueña puede cambiar a "hormozi" */}
-      <FraseAncla />
-      <ParaQuien />
-      <Mecanismo />
-      <Disciplinas />
-      <Estratega />
-      <Cierre />
-    </main>
+    <>
+      <script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }} />
+      <main>
+        <Hero variant="editorial" /> {/* dueña puede cambiar a "hormozi" */}
+        <FraseAncla />
+        <ParaQuien />
+        <Mecanismo />
+        <Disciplinas />
+        <Estratega />
+        <Cierre />
+      </main>
+    </>
   );
 }