feat: add team configuration fields to Event model

Add fields for team durability, partner rotation, and configuration:
- teamDurability: permanent, variable, or per_round
- partnerRotation: none, minimize_repeat, maximize_even, elo_based
- allowByes: handle odd participant counts
- teamConfiguration: JSON for additional options
- maxRosterChanges: limit roster changes per player
- requireAdminVerify: for match score verification

Refs #22

prisma/migrations/20260404022013_add_team_configuration/migration.sql

@@ -0,0 +1,7 @@
+-- AlterTable
+ALTER TABLE "events" ADD COLUMN     "allowByes" BOOLEAN NOT NULL DEFAULT true,
+ADD COLUMN     "maxRosterChanges" INTEGER,
+ADD COLUMN     "partnerRotation" TEXT NOT NULL DEFAULT 'none',
+ADD COLUMN     "requireAdminVerify" BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN     "teamConfiguration" JSONB,
+ADD COLUMN     "teamDurability" TEXT NOT NULL DEFAULT 'permanent';