feat: enhance validation schemas with comprehensive tests for user roles, settings, exams, and collections

backend/tsconfig.json

@@ -16,5 +16,5 @@
     "isolatedModules": true
   },
   "include": ["src/**/*"],
-  "exclude": ["node_modules", "dist"]
+  "exclude": ["node_modules", "dist", "src/**/*.test.ts", "src/**/*.spec.ts"]
 }