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/[id]/route.ts

@@ -144,6 +144,7 @@ export async function PUT(request: Request, { params }: RouteParams) {
       description,
       eventDate,
       eventType,
+      tournamentType,
       format,
       status,
       maxParticipants,
@@ -166,6 +167,7 @@ export async function PUT(request: Request, { params }: RouteParams) {
       description: description || null,
       eventDate: eventDate ? new Date(eventDate) : null,
       eventType: eventType || "tournament",
+      tournamentType: tournamentType || "individual",
       format: format || "round_robin",
       maxParticipants: maxParticipants ? parseInt(maxParticipants) : null,
       targetScore: targetScore ? parseInt(targetScore) : null,