feat: add site_admin role, casual match support, and tournament deletion

prisma/migrations/20260330214501_add_site_admin_and_casual_match/migration.sql

@@ -0,0 +1,2 @@
+-- Add isCasual field to Match model
+ALTER TABLE "matches" ADD COLUMN "isCasual" BOOLEAN NOT NULL DEFAULT false;

prisma/schema.prisma

@@ -41,7 +41,7 @@ model User {
   emailVerified    Boolean   @default(false)
   name             String?
   image            String?
-  role             String    @default("player")
+  role             String    @default("player") // player, tournament_admin, club_admin, site_admin
   playerId         Int?      @unique
   createdAt        DateTime  @default(now())
   updatedAt        DateTime  @updatedAt
@@ -163,6 +163,7 @@ model Match {
   team1Score       Int
   team2Score       Int
   status           String            @default("completed")
+  isCasual         Boolean           @default(false)
   createdById      String?
   createdAt        DateTime          @default(now())
   updatedAt        DateTime          @updatedAt