feat(bookings): implement booking system and confirmation flow

Add database tables and repository for managing bookings
Create API endpoints for booking submission and capacity management
Update landing page to persist bookings before WhatsApp redirection

app/layouts/default.vue

@@ -326,6 +326,12 @@ const mobileMenuOpen = ref(false)
 await auth.fetchSession()
 
 const allSystemMenuItems: SystemMenuItem[] = [
+  {
+    label: 'Bookings',
+    to: '/bookings',
+    icon: 'i-lucide-clipboard-list',
+    matches: (path) => path.startsWith('/bookings')
+  },
   {
     label: 'Security',
     to: '/security',