fix(ap): store avatar_url from fetched actor in remote_actors when following

crates/adapters/activitypub-base/src/service.rs

@@ -571,7 +571,7 @@ impl ActivityPubService {
             inbox_url: remote_actor.inbox_url.to_string(),
             shared_inbox_url: None,
             display_name: Some(remote_actor.username.clone()),
-            avatar_url: None,
+            avatar_url: remote_actor.avatar_url.as_ref().map(|u| u.to_string()),
             outbox_url: Some(remote_actor.outbox_url.to_string()),
         };
         data.federation_repo