feat(sprint3-step1-2): vision B2B + Tailwind tokens + LandingPage + Pricing B2B

frontend/src/components/layout/Footer.tsx

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+export default function Footer() {
+  return (
+    <footer className="border-t border-od-border bg-od-bg">
+      <div className="mx-auto flex max-w-6xl items-center justify-between px-6 py-6">
+        <div className="flex items-center gap-2">
+          <span className="font-mono text-xs font-bold tracking-[0.2em] text-od-accent">OD</span>
+          <span className="text-xs text-od-muted">OriginsDigital</span>
+        </div>
+        <p className="font-mono text-2xs text-od-muted">
+          © {new Date().getFullYear()} OriginsDigital — Tous droits réservés
+        </p>
+        <div className="flex items-center gap-6">
+          <a href="mailto:contact@originsdigital.com" className="font-mono text-2xs text-od-muted hover:text-od-text transition-colors duration-150">
+            Contact
+          </a>
+          <span className="font-mono text-2xs text-od-muted">Powered by SuperOAuth</span>
+        </div>
+      </div>
+    </footer>
+  );
+}