[Feature] Write-protection/read-only for shared people

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature Good morning Immich users and developers ! First of all, I would like to address a huge thanks to the devs for the awesome people sharing feature introduced in 3.2.0 then 3.3.0, I (and a lot of other users) had been waiting for a long time. I know the amount of work it required and I am very grateful for this. Anyway, when I found out about the 3.3.0 release, I immediately updated and configured sharing with other family members and even achieved face-recognition-based assets sharing across all users via immich-pta and partner sharing. For this sharing to work correctly, every user obviously needed to merge their own people with the shared ones. So, I simply showed them all how to do and as it is relatively simple, I left them do it on their own. The problem is the following : my granddad didn't fully understand and merged the shared pe…