feat(web): complete MVP0 public layout, banner, and SEO baseline

apps/web/src/app/[locale]/about/page.tsx

@@ -0,0 +1,13 @@
+import { getTranslations } from "next-intl/server"
+
+export default async function AboutPage() {
+  const t = await getTranslations("About")
+
+  return (
+    <section className="mx-auto w-full max-w-6xl space-y-4 px-6 py-16">
+      <p className="text-sm uppercase tracking-[0.2em] text-neutral-500">{t("badge")}</p>
+      <h1 className="text-4xl font-semibold tracking-tight">{t("title")}</h1>
+      <p className="max-w-3xl text-neutral-600">{t("description")}</p>
+    </section>
+  )
+}