Update api_service to use WebSockets

### Describe your improvement idea or feature request

The new JobQueue system in CCSync does not directly tell the status of the Job or its response, but uses a WebSocket instead.
Integrate this to the `api_service.dart` using [web sockets library in Flutter](https://pub.dev/packages/web_socket_channel).

### How would you like to see it implemented?

1. The user adds/deletes/marks as completed, deleted just like earlier, but
2. Websocket is used to get the message/status and shows the relevant Snackbar
Similar to [this](https://github.com/CCExtractor/ccsync/pull/71)

### Put here any screenshots or videos (optional)

_No response_

### How can we contact you (optional)

Github/Slack

### Would you like to work on this issue?

None

### By submitting this issue, I have confirmed that:

- [X] I have starred the repo ⭐ and watched 👀 it on GitHub and followed the contribution guidelines.

Lee api_service.dart y compara el flujo de WebSocket propuesto con el pull request #71, utilizando la biblioteca web_socket_channel referenciada en la issue. Verifica que las acciones add, delete y complete sigan funcionando y que el estado de JobQueue o los mensajes de respuesta produzcan la Snackbar correspondiente.

Escrito por el modelo de indexación a partir del texto del issue.