feat: add ticket workflow pages

frontend/src/app/router.tsx

@@ -1,6 +1,9 @@
 import * as React from 'react'
 
 import { DesignSystemPreview } from '@/features/design-system/DesignSystemPreview'
+import { TicketCreatePage } from '@/features/tickets/TicketCreatePage'
+import { TicketDetailPage } from '@/features/tickets/TicketDetailPage'
+import { TicketListPage } from '@/features/tickets/TicketListPage'
 
 function getRoute() {
   return window.location.hash.replace(/^#/, '') || '/tickets'
@@ -19,12 +22,14 @@ export function Router() {
     return <DesignSystemPreview />
   }
 
-  return (
-    <main className="min-h-screen bg-background p-6 text-foreground">
-      <div className="mx-auto max-w-6xl">
-        <p className="text-sm text-muted-foreground">Route</p>
-        <h1 className="mt-2 text-xl font-semibold">{route}</h1>
-      </div>
-    </main>
-  )
+  if (route === '/tickets/new') {
+    return <TicketCreatePage />
+  }
+
+  const ticketMatch = route.match(/^\/tickets\/(\d+)$/)
+  if (ticketMatch) {
+    return <TicketDetailPage ticketId={Number(ticketMatch[1])} />
+  }
+
+  return <TicketListPage />
 }