Initial commit: Item Interaction Ecosystem plugin (UE5.7)

Server-authoritative, data-driven item/inventory/interaction/carry/equipment/
world-slot/placement/crafting framework. 8 modules, compiles against UE 5.7.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Source/ItemWorld/Public/StorageContainerActor.h

@@ -0,0 +1,38 @@
+// Copyright ExByte Studios. Item Interaction Ecosystem.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "GameFramework/Actor.h"
+#include "StorageContainerActor.generated.h"
+
+class UStaticMeshComponent;
+class UInteractableComponent;
+class UInventoryComponent;
+
+/**
+ * A lootable world container (chest, crate, fridge, vehicle cargo, corpse) (section 5).
+ * Its inventory is shared-replicated so any nearby player who opens it sees the
+ * contents; transfers go through the validated server path (section 31.2).
+ */
+UCLASS()
+class ITEMWORLD_API AStorageContainerActor : public AActor
+{
+	GENERATED_BODY()
+
+public:
+	AStorageContainerActor();
+
+	UFUNCTION(BlueprintPure, Category = "Storage")
+	UInventoryComponent* GetStorageInventory() const { return Storage; }
+
+protected:
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Storage")
+	TObjectPtr<UStaticMeshComponent> Mesh;
+
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Storage")
+	TObjectPtr<UInteractableComponent> Interactable;
+
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Storage")
+	TObjectPtr<UInventoryComponent> Storage;
+};