working with login and building inventory

trade-hub/backend/app/catalog.py

@@ -0,0 +1,8 @@
+"""Single owner of the immutable, read-only scunpacked catalog.
+
+Keeping the store here (instead of in app/api.py) lets the auth and inventory
+routers import it without importing the FastAPI app itself.
+"""
+from app import loader
+
+store = loader.load_store()