Add initial implementation of game mechanics and resources management

Scenes/Main/MiracleButton.cs

@@ -0,0 +1,42 @@
+using Godot;
+using ParasiticGod.Scripts.Core;
+using ParasiticGod.Scripts.Singletons;
+
+namespace ParasiticGod.Scenes.Main;
+
+public partial class MiracleButton : Button
+{
+    private MiracleDefinition _miracle;
+
+    public override void _Ready()
+    {
+        if (_miracle == null)
+        {
+            GD.PrintErr($"MiracleButton '{Name}' has no MiracleDefinition assigned.");
+            SetProcess(false);
+            return;
+        }
+        
+        Text = $"{_miracle.Name}\nCost: {_miracle.FaithCost} Faith";
+        
+        Pressed += OnPressed;
+    }
+
+    public override void _ExitTree()
+    {
+        Pressed -= OnPressed;
+    }
+
+    private void OnPressed()
+    {
+        GameBus.Instance.PerformMiracle(_miracle);
+    }
+
+    public void SetMiracle(MiracleDefinition miracle)
+    {
+        _miracle = miracle;
+        Text = $"{_miracle.Name}\nCost: {_miracle.FaithCost} Faith";
+    }
+
+    public MiracleDefinition GetMiracle() { return _miracle; }
+}