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

apps/web/src/components/public-site-footer.tsx

@@ -0,0 +1,21 @@
+"use client"
+
+import { useTranslations } from "next-intl"
+
+export function PublicSiteFooter() {
+  const t = useTranslations("Layout")
+  const year = new Date().getFullYear()
+
+  return (
+    <footer className="border-t border-neutral-200 bg-neutral-50">
+      <div className="mx-auto flex w-full max-w-6xl flex-wrap items-center justify-between gap-2 px-6 py-4 text-sm text-neutral-600">
+        <p>
+          {t("footer.copyright", {
+            year,
+          })}
+        </p>
+        <p>{t("footer.tagline")}</p>
+      </div>
+    </footer>
+  )
+}