Add run management screen to admin panel

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/admin/AdminLayout.tsx

@@ -4,6 +4,7 @@ const navItems = [
   { to: '/admin/games', label: 'Games' },
   { to: '/admin/pokemon', label: 'Pokemon' },
   { to: '/admin/evolutions', label: 'Evolutions' },
+  { to: '/admin/runs', label: 'Runs' },
 ]
 
 export function AdminLayout() {