[Task]: Delete files after specified period if it is not owned anymore

### Task description

If a NFT is not owned anymore, at some point we want to delete the related files.
In the settings, we need a way to input the amount of days for how long the user wants to keep the nfts after not owning them.

### Requirements

- [ ] Add Setting section for media expiry time
- [ ] Add Days input (dropdown with (0,1,7,30,never) or number input?)
- [ ] On login check not owned nfts for their not owned time and remove them

### Acceptance criteria

Meets the above requirements.

### Creation checklist

- [ ] I have assigned this task to the correct people
- [X] I have added the most appropriate labels
- [X] I have linked the correct milestone and/or project