fix: add type assertion for PRIZE_CONFIG access in client page

Add type assertion to handle prize types that may not exist in PRIZE_CONFIG
(PHYSICAL, DISCOUNT, GRAND_PRIZE). This prevents TypeScript compilation errors
when accessing the PRIZE_CONFIG object with dynamic prize types.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/client/page.tsx

@@ -211,7 +211,7 @@ export default function ClientPage() {
                 <tbody className="bg-white divide-y divide-gray-200">
                   {tickets.slice(0, 5).map((ticket) => {
                     const prizeConfig = ticket.prize
-                      ? PRIZE_CONFIG[ticket.prize.type]
+                      ? PRIZE_CONFIG[ticket.prize.type as keyof typeof PRIZE_CONFIG]
                       : null;
 
                     return (