chore(shop): scaffold empty shop app

startapp scaffold registered in INSTALLED_APPS; no models yet.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

clubmanager/settings.py

@@ -50,6 +50,7 @@ INSTALLED_APPS = [
     "teams.apps.TeamsConfig",
     "events.apps.EventsConfig",
     "formbuilder.apps.FormbuilderConfig",
+    "shop.apps.ShopConfig",
 ]
 
 MIDDLEWARE = [