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/wsgi.py

@@ -0,0 +1,9 @@
+"""
+WSGI config for poker_api project.
+"""
+
+import os
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'poker_api.settings')
+application = get_wsgi_application()