- Implemented `WebSocketsGateway` for handling Socket.IO connections, events, and rooms.
- Added `WebSocketsService` to act as a facade for emitting WebSocket events (projects, groups, notifications).
- Registered `WebSocketsModule` and integrated it into `AppModule`.
- Enabled real-time updates in `ProjectsService` and `GroupsService` with relevant WebSocket events (create, update, delete, collaborator/group actions).
