fix(phase1.4): fix score calculation - remove wrong decrement on level up

- Remove the buggy 'newScore--' line that was penalizing level ups
- Score now correctly accumulates: each food = (+1 * current_level) points
- Level 1: 1 food = +1 point
- Level 2: 1 food = +2 points
- Level 3: 1 food = +3 points, etc.
- No penalty on leveling up, just speed increase
- Score calculation now makes intuitive sense

src/useGameStatus/useGameStatus.ts

@@ -92,7 +92,6 @@ export function useGameStatus(
             setScore((prev) => {
               let newScore = prev + levelRef.current;
               if (foodsEatenRef.current >= FOODS_PER_LEVEL) {
-                newScore--;
                 const newLevel = levelRef.current + 1;
                 levelRef.current = newLevel;
                 setLevel(newLevel);