Implement Django backend and Vue frontend structure

- Django backend with projects, templates, exports apps
- SQLite database models for Project, Asset, CardLayer
- REST API endpoints for project management
- Vue frontend with Vite, Element Plus, Fabric.js
- Home page for project selection
- Editor page with Fabric.js canvas integration

backend/poker_api/urls.py

@@ -0,0 +1,14 @@
+from django.urls import path, include
+from django.conf import settings
+from django.conf.urls.static import static
+
+urlpatterns = [
+    path('api/', include([
+        path('', include('apps.projects.urls')),
+        path('', include('apps.templates.urls')),
+        path('', include('apps.exports.urls')),
+    ])),
+]
+
+if settings.DEBUG:
+    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)