Format code with Black and isort for CI/CD compliance

- Apply Black formatting to all Python files in core and stiftung modules
- Fix import statement ordering with isort
- Ensure all code meets automated quality standards
- Resolve CI/CD pipeline formatting failures
- Maintain consistent code style across the entire codebase

app/core/urls.py

@@ -1,17 +1,21 @@
-from django.contrib import admin
-from django.urls import path, include
 from django.conf import settings
 from django.conf.urls.static import static
+from django.contrib import admin
 from django.contrib.auth import views as auth_views
+from django.urls import include, path
+
 from stiftung.views import home
 
 urlpatterns = [
-    path('', include('stiftung.urls')),
-    path('admin/', admin.site.urls),
-    
+    path("", include("stiftung.urls")),
+    path("admin/", admin.site.urls),
     # Authentication URLs
-    path('login/', auth_views.LoginView.as_view(template_name='registration/login.html'), name='login'),
-    path('logout/', auth_views.LogoutView.as_view(), name='logout'),
+    path(
+        "login/",
+        auth_views.LoginView.as_view(template_name="registration/login.html"),
+        name="login",
+    ),
+    path("logout/", auth_views.LogoutView.as_view(), name="logout"),
 ]
 
 if settings.DEBUG: