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/ItemCore/Public/ItemCoreModule.h

@@ -0,0 +1,19 @@
+// Copyright ExByte Studios. Item Interaction Ecosystem.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Modules/ModuleManager.h"
+
+/**
+ * ItemCore module.
+ * Foundation of the Item Interaction Ecosystem: base item structs, ids,
+ * runtime properties, location/state enums and shared log categories.
+ * Contains zero gameplay logic - only data types every other module shares.
+ */
+class FItemCoreModule : public IModuleInterface
+{
+public:
+	virtual void StartupModule() override;
+	virtual void ShutdownModule() override;
+};