privacy/security: add PM privacy levels and improve session visibility

app/users/router.py

@@ -67,6 +67,7 @@ async def update_profile(
         bio=payload.bio,
         avatar_url=payload.avatar_url,
         allow_private_messages=payload.allow_private_messages,
+        privacy_private_messages=payload.privacy_private_messages,
         privacy_last_seen=payload.privacy_last_seen,
         privacy_avatar=payload.privacy_avatar,
         privacy_group_invites=payload.privacy_group_invites,