Fix Django API routing and authentication issues

- Add django.contrib.auth to INSTALLED_APPS
- Fix URL routing structure for proper API endpoints
- Add API root endpoint with endpoint information
- Verify all API endpoints working correctly

backend/poker_api/settings.py

@@ -15,6 +15,7 @@ ALLOWED_HOSTS = ['localhost', '127.0.0.1']
 
 INSTALLED_APPS = [
     'django.contrib.contenttypes',
+    'django.contrib.auth',
     'django.contrib.staticfiles',
     'rest_framework',
     'corsheaders',

backend/poker_api/urls.py

@@ -1,13 +1,25 @@
 from django.urls import path, include
 from django.conf import settings
 from django.conf.urls.static import static
+from django.http import JsonResponse
+
+
+def api_root(request):
+    return JsonResponse({
+        'message': 'Poker Card Design System API',
+        'version': '1.0',
+        'endpoints': {
+            'projects': '/api/projects/',
+            'templates': '/api/templates/',
+        }
+    })
+
 
 urlpatterns = [
-    path('api/', include([
-        path('', include('apps.projects.urls')),
-        path('', include('apps.templates.urls')),
-        path('', include('apps.exports.urls')),
-    ])),
+    path('', api_root),
+    path('api/projects/', include('apps.projects.urls')),
+    path('api/templates/', include('apps.templates.urls')),
+    path('api/', include('apps.exports.urls')),
 ]
 
 if settings.DEBUG: