GHSA-95q8-x6r6-672m: Lemmy may expose private community data through community, saved, liked, and modlog API views

Lemmy applies private-community checks in PostView and CommentView, but several adjacent API views skip the accepted-follower filter. Bob, a registered user who is not an accepted follower, can read private community sidebar and summary fields. Alice, a former accepted follower, can still read saved and liked private post bodies after she leaves. An unauthenticated visitor can read private community metadata and removed private post names through the modlog.