Enhance user profiles with character class feature: Add character class field to user model and update related API routes, UI components, and validation logic. This update improves user profile customization and leaderboard entries by allowing users to select and display their character class.

prisma/migrations/20251209210032_add_character_class/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "User" ADD COLUMN "characterClass" TEXT;