game: add: goal statistic

frontend/static/js/api/game/GameConfig.js

@@ -82,6 +82,11 @@ class GameConfig
          */
         this.stroke_thickness = response_data.STROKE_THICKNESS;
 
+        /**
+         * @type {Number}
+         */
+        this.game_max_score = response_data.GAME_MAX_SCORE;
+
         return 0;
     }
 }