feat(legal): add /policies, /contact, /promotions for Stripe verification

Adds the consolidated Customer Policies doc covering customer service contact,
return / refund / dispute policy, cancellation policy, U.S. legal and export
restrictions, and promotional terms. Companion /contact page surfaces the
business phone (470) 949-4131 alongside the support/sales/billing/security
inboxes and target response SLAs. /promotions page exists as a stub so the
cross-reference in Policies §6.2 is live; it states no promotions are
currently active and will be appended to when offers run.

Refresh Privacy and Terms footers to point at /contact + /policies and drop
the stale hello@ mailto. Landing footer now exposes Privacy / Terms /
Policies / Contact links so Stripe's site review can reach them in one hop
from the marketing surface.

Mailing address is deferred until a P.O. Box is set up — left as an
in-source TODO and displayed publicly as "available on request" so we
don't ship a placeholder address.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.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 />,