feat: add tournament type and team support to tournament APIs

Update tournament APIs to support:
- tournamentType field (individual/team)
- Team creation for team tournaments
- Even number validation for team tournaments
- Automatic pairing of consecutive players into teams

src/app/api/tournaments/route.ts

@@ -69,7 +69,7 @@ export async function POST(request: Request) {
     }
 
     const body = await request.json();
-    const { name, format, eventDate, targetScore, allowTies } = body;
+    const { name, format, eventDate, targetScore, allowTies, maxParticipants, tournamentType } = body;
 
     const tournament = await prisma.event.create({
       data: {
@@ -77,10 +77,13 @@ export async function POST(request: Request) {
         format: format || "round_robin",
         eventDate: eventDate ? new Date(eventDate) : null,
         eventType: "tournament",
+        tournamentType: tournamentType || "individual",
         status: "planned",
-        ownerId: session.user.id, // Assign ownership to the creator
+        ownerId: session.user.id,
         targetScore: targetScore ? parseInt(targetScore) : null,
         allowTies: allowTies ?? false,
+        maxParticipants: maxParticipants ? parseInt(maxParticipants) : null,
+        description: body.description,
       },
     });