feat: Update user entity with role support

lib/euchre_camp/entities/user.rb

@@ -29,10 +29,21 @@ module EuchreCamp
         confirmed && !locked?
       end
 
-      # Check if user is admin (for navigation purposes)
-      # This would be enhanced with actual role checking later
+      # Check user role
       def admin?
-        false  # Placeholder - implement role checking later
+        role == 'club_admin' || role == 'system_admin'
+      end
+
+      def tournament_admin?
+        role == 'tournament_admin' || admin?
+      end
+
+      def club_admin?
+        role == 'club_admin' || role == 'system_admin'
+      end
+
+      def player?
+        role == 'player'
       end
     end
   end