Scheduled Snapshot Creation

### Epic

https://github.com/flowforge/flowforge/issues/2421

### Description

As a FlowForge User,

I want to have the system automatically create a snapshot of my Node-RED instance every night (scheduled),

So that I can always be sure to have a recent backup available.

### Which customers would this be availble to

Licensed Edition (EE)

### Acceptance Criteria

- [ ] FF should provide an option to set an automatic schedule for creating snapshots, such as every night.
- [ ] The user should be able to view the schedule and the status of automatic snapshots

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate