Introduces WebSocket-based real-time updates for the shopping list.
Changes to items (add, mark, delete) are now instantly reflected
across all connected user sessions without requiring a page refresh.
This commit:
- Extends the WebSocket ConnectionManager to broadcast item updates.
- Modifies item manipulation endpoints (add, mark, delete) to trigger broadcasts.
- Updates the frontend to listen for update broadcasts and refresh the list.
- Updates README.md to reflect the new real-time update feature.
Désiré Werner Menrath
a7d88be89c
