feat(legal): add /policies, /contact, /promotions pages + MarketingFooter (#165)

Adds the three legal/contact pages needed for Stripe live-mode site review: /policies (consolidated customer policies — refunds, cancellation, legal restrictions, promotions), /contact (phone (470) 949-4131 + support/sales/billing/security inboxes), /promotions (stub satisfying §6.2 cross-ref).

Extracts the existing landing footer into components/common/MarketingFooter.tsx and mounts it on /pricing and /contact-sales so all four legal links are reachable from every marketing surface.

Privacy and Terms closing sections updated to point at /contact + /policies; stale hello@ mailto removed.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Co-authored-by: Michael Chihlas <michael@resolutionflow.com>
Co-committed-by: Michael Chihlas <michael@resolutionflow.com>

frontend/src/router.tsx

@@ -24,6 +24,9 @@ const PrivacyPage = lazyWithRetry(() => import('@/pages/PrivacyPage'))
 const TermsPage = lazyWithRetry(() => import('@/pages/TermsPage'))
 const PricingPage = lazyWithRetry(() => import('@/pages/PricingPage'))
 const ContactSalesPage = lazyWithRetry(() => import('@/pages/ContactSalesPage'))
+const ContactPage = lazyWithRetry(() => import('@/pages/ContactPage'))
+const PoliciesPage = lazyWithRetry(() => import('@/pages/PoliciesPage'))
+const PromotionsPage = lazyWithRetry(() => import('@/pages/PromotionsPage'))
 
 // Standalone auth pages
 const VerifyEmailPage = lazyWithRetry(() => import('@/pages/VerifyEmailPage'))
@@ -145,6 +148,21 @@ export const router = sentryCreateBrowserRouter([
     element: page(ContactSalesPage),
     errorElement: <RouteError />,
   },
+  {
+    path: '/contact',
+    element: page(ContactPage),
+    errorElement: <RouteError />,
+  },
+  {
+    path: '/policies',
+    element: page(PoliciesPage),
+    errorElement: <RouteError />,
+  },
+  {
+    path: '/promotions',
+    element: page(PromotionsPage),
+    errorElement: <RouteError />,
+  },
   {
     path: '/login',
     element: <LoginPage />,