refactor: Replace hardcoded node paths with constants and remove ScoreComponent.

scripts/components/ExitDoorComponent.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.Autoloads;
 using Mr.BrickAdventures.scripts.interfaces;
 
@@ -12,25 +13,25 @@ public partial class ExitDoorComponent : Area2D, IUnlockable
     [Export] public AudioStreamPlayer2D OpenDoorSfx { get; set; }
     [Export] public int OpenedDoorFrame { get; set; } = 0;
     [Export] public string AchievementId = "level_complete_1";
-    
+
     [Signal] public delegate void ExitTriggeredEventHandler();
-    
+
     private GameManager _gameManager;
     private AchievementManager _achievementManager;
 
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
-        _achievementManager = GetNode<AchievementManager>("/root/AchievementManager");
-        
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+        _achievementManager = GetNode<AchievementManager>(Constants.AchievementManagerPath);
+
         BodyEntered += OnExitAreaBodyEntered;
-        
+
     }
 
     private void OnExitAreaBodyEntered(Node2D body)
     {
         if (Locked) return;
-        
+
         EmitSignalExitTriggered();
         _achievementManager.UnlockAchievement(AchievementId);
         _gameManager.UnlockLevel((int)_gameManager.PlayerState["current_level"] + 1);