Add door interaction system with state management and event publishing

GameCore/Interaction/RequiresItemRequirement.cs

@@ -0,0 +1,26 @@
+using GameCore.ECS;
+using GameCore.Events;
+using GameCore.Interaction.Interfaces;
+using GameCore.Inventory;
+
+namespace GameCore.Interaction;
+
+public class RequiresItemRequirement(string itemId, int quantity, bool consumeItem) : IInteractionRequirement
+{
+    public bool IsMet(Entity interactor, World world)
+    {
+        var inventory = world.GetComponent<InventoryComponent>(interactor);
+        return inventory != null && inventory.HasItem(itemId, quantity);
+    }
+
+    public void ApplySideEffects(Entity interactor, World world)
+    {
+        if (!consumeItem) return;
+
+        var inventory = world.GetComponent<InventoryComponent>(interactor);
+        if (inventory == null || !inventory.RemoveItem(itemId, quantity)) return;
+
+        var newQuantity = inventory.GetItemCount(itemId);
+        world.PublishEvent(new InventoryItemChangedEvent(interactor, itemId, newQuantity));
+    }
+}