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/ItemDatabase/Private/ItemEcosystemSettings.cpp

@@ -0,0 +1,13 @@
+// Copyright ExByte Studios. Item Interaction Ecosystem.
+
+#include "ItemEcosystemSettings.h"
+
+UItemEcosystemSettings::UItemEcosystemSettings()
+{
+	CategoryName = FName("Game");
+}
+
+const UItemEcosystemSettings* UItemEcosystemSettings::Get()
+{
+	return GetDefault<UItemEcosystemSettings>();
+}