update init files

src/logic/__init__.py

@@ -1,2 +1,3 @@
 __help__ = "This package contains the logic of the application."
 from .database import Database
+from .catalogue import Catalogue

src/schemas/__init__.py

@@ -1,2 +1,3 @@
 from .database import LOANS, MEDIA, USERS
 from .user import User
+from .book import Book