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/ItemInteraction/Public/InteractableComponent.h

@@ -0,0 +1,48 @@
+// Copyright ExByte Studios. Item Interaction Ecosystem.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Components/ActorComponent.h"
+#include "GameplayTagContainer.h"
+#include "InteractableComponent.generated.h"
+
+class UInteractionAction;
+
+/**
+ * Marks an actor as interactable and lists the actions it offers (section 8.1).
+ * Attach to pickups, chests, vehicles, generators, doors, workbenches, corpses,
+ * placed items, quest objects, etc.
+ */
+UCLASS(ClassGroup = (Interaction), meta = (BlueprintSpawnableComponent))
+class ITEMINTERACTION_API UInteractableComponent : public UActorComponent
+{
+	GENERATED_BODY()
+
+public:
+	UInteractableComponent();
+
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Interaction")
+	FGameplayTag InteractableType;
+
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Interaction")
+	FText DisplayName;
+
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Interaction")
+	float InteractionDistance = 250.f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Interaction")
+	bool bRequiresLineOfSight = true;
+
+	/** Free-form world tags exposed to the interaction context (e.g. Vehicle, Generator). */
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Interaction")
+	FGameplayTagContainer InteractionTags;
+
+	/** Explicit action classes this object offers (in addition to data-driven item rows). */
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Instanced, Category = "Interaction")
+	TArray<TObjectPtr<UInteractionAction>> AvailableActions;
+
+	/** Server-side soft claim so two players don't interact with the same object at once. */
+	UPROPERTY(BlueprintReadOnly, Category = "Interaction")
+	bool bIsBusy = false;
+};