chore(deploy): Update production configuration for ASGI and new URL structure

- Switched production start script from Gunicorn to Daphne to support WebSockets.
- Updated VITE_API_URL in frontend production env to 'https://api.smoothschedule.com', removing the '/api' prefix to align with the backend URL refactor.

frontend/.env.production

@@ -1,3 +1,3 @@
 # Production environment variables
 # Use relative API URL - will use same origin as the page
-VITE_API_URL=/api
+VITE_API_URL=https://api.smoothschedule.com

smoothschedule/compose/production/django/start

@@ -7,4 +7,5 @@ set -o nounset
 
 python /app/manage.py collectstatic --noinput
 
-exec gunicorn config.wsgi --bind 0.0.0.0:5000 --chdir=/app
+# Start Daphne (ASGI) instead of Gunicorn (WSGI) to support WebSockets
+exec daphne -b 0.0.0.0 -p 5000 config.asgi:application