Add shop, POS sync, event ticketing, and shipping catalog apps.

Clients can run in-house retail without Shopify while keeping the same
Docker/Django/Postgres stack and data-ownership promise. Closes #5.

site/client_site/urls.py

@@ -48,5 +48,19 @@ if apps.is_installed("social_ai"):
     urlpatterns += [
         path("portal/social/api/generate/", include("social_ai.urls")),
     ]
+if apps.is_installed("shop"):
+    urlpatterns += [
+        path("shop/", include("shop.public_urls")),
+        path("portal/shop/", include("shop.portal_urls")),
+    ]
+if apps.is_installed("pos_sync"):
+    urlpatterns += [path("portal/pos/", include("pos_sync.urls"))]
+if apps.is_installed("events"):
+    urlpatterns += [
+        path("events/", include("events.public_urls")),
+        path("portal/events/", include("events.portal_urls")),
+    ]
+if apps.is_installed("shipping"):
+    urlpatterns += [path("portal/shipping/", include("shipping.urls"))]
 
 handler404 = "public.views.page_not_found"