Refactor game state management to use a unified Stat system and update UI labels for production and corruption

Scripts/Core/StatData.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace ParasiticGod.Scripts.Core;
+
+public class StatData
+{
+    public double Value { get; private set; }
+    public event Action<double> OnChanged;
+
+    public void Set(double value)
+    {
+        if (!(Math.Abs(Value - value) > 0.001)) return;
+        
+        Value = value;
+        OnChanged?.Invoke(Value);
+    }
+}