feat: add solution library pages

frontend/src/app/router.tsx

@@ -1,6 +1,7 @@
 import * as React from 'react'
 
 import { DesignSystemPreview } from '@/features/design-system/DesignSystemPreview'
+import { SolutionListPage } from '@/features/solutions/SolutionListPage'
 import { TicketCreatePage } from '@/features/tickets/TicketCreatePage'
 import { TicketDetailPage } from '@/features/tickets/TicketDetailPage'
 import { TicketListPage } from '@/features/tickets/TicketListPage'
@@ -22,6 +23,10 @@ export function Router() {
     return <DesignSystemPreview />
   }
 
+  if (route === '/solutions') {
+    return <SolutionListPage />
+  }
+
   if (route === '/tickets/new') {
     return <TicketCreatePage />
   }