Add ammo consumption and item pickup systems

GameCore/Combat/Effects/ConsumeAmmoCost.cs

@@ -0,0 +1,19 @@
+using GameCore.Combat.Interfaces;
+using GameCore.Inventory;
+
+namespace GameCore.Combat.Effects;
+
+public class ConsumeAmmoCost(string ammoId, int amount) : ICostEffect
+{
+    public void Execute(EffectContext context)
+    {
+        var inventory = context.World.GetComponent<InventoryComponent>(context.Owner);
+        inventory?.RemoveItem(ammoId, amount);
+    }
+
+    public bool CanAfford(EffectContext context)
+    {
+        var inventory = context.World.GetComponent<InventoryComponent>(context.Owner);
+        return inventory != null && inventory.HasItem(ammoId, amount);
+    }
+}