feat: add inventory metadata updates

backend/app/inventory/__init__.py

@@ -8,6 +8,7 @@ from app.inventory.exceptions import (
 )
 from app.inventory.models import (
     InventoryCreateRequest,
+    InventoryMetadataUpdateRequest,
     InventoryMinerDetail,
     InventoryMinerSummary,
     InventorySearchFilters,
@@ -21,6 +22,7 @@ __all__ = [
     "DuplicateAssetID",
     "InventoryCreateRequest",
     "InventoryError",
+    "InventoryMetadataUpdateRequest",
     "InventoryMinerDetail",
     "InventoryMinerSummary",
     "InventoryRepository",