IDEM for invite

If a matelist has no longer any participants, it is deleted

The owner of the matelist should be able to invite someone via email.
The operation should create an invitation, with a "pending" status.
Simultaneously, an email should be sent to the target email address !

A foreign key bug pops up

Ask the invitee to provide its email to verify of its identity

Name of the playlist like "#name from Matelist"

• Spotify
• Deezer

Create even if the playlist with the same name exists (it shouldn't matter)
If the creation fails, user should be informed and the create stopped

When creating a playlist Object : also create the playlist on platform
Refractor to move all api-related stuff out of controllers

Upon creation of an invite,

• generate a one time url (the url should allow to accept the invitation or refuse it)