refactor: standardization round 2

- ConsoleManager: lazy GameManager/AchievementManager via Instance (fixes NullRef on console commands)
- AchievementManager, GhostManager: add static Instance property
- GhostEventHandler: use GhostManager.Instance, add _ExitTree unsubscription
- SpeedRunManager: remove unused IsVisible guard; TimeUpdated now emits when running
- SpeedRunHud: use SpeedRunManager.Instance, remove dead IsVisible binding
- SaveDataDto: moved to scripts/State/SaveDataDto.cs
- GameManager.AddCoins: XML doc clarifying permanent vs session coins

Autoloads/SpeedRunManager.cs

@@ -11,8 +11,7 @@ public partial class SpeedRunManager : Node
     public override void _ExitTree() { if (Instance == this) Instance = null; }
 
     public bool IsRunning { get; private set; } = false;
-    public bool IsVisible { get; private set; } = false;
-    
+
     private double _startTime;
     private double _levelStartTime;
     private List<double> _splits = [];
@@ -21,7 +20,7 @@ public partial class SpeedRunManager : Node
 
     public override void _Process(double delta)
     {
-        if (!IsRunning || !IsVisible) return;
+        if (!IsRunning) return;
         
         EmitSignalTimeUpdated(GetCurrentTotalTime(), GetCurrentLevelTime());
     }