feat(activitypub-base): impl actor_json port; return full user@domain handle from lookup

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

@@ -1382,9 +1382,12 @@ impl domain::ports::FederationActionPort for ActivityPubService {
                 domain::errors::DomainError::ExternalService(e.to_string())
             })?;
 
+        let domain_str = actor.ap_id.host_str().unwrap_or("");
+        let full_handle = format!("{}@{}", actor.username, domain_str);
+
         Ok(domain::models::remote_actor::RemoteActor {
             url: actor.ap_id.to_string(),
-            handle: actor.username.clone(),
+            handle: full_handle,
             display_name: Some(actor.username.clone()),
             inbox_url: actor.inbox_url.to_string(),
             shared_inbox_url: None,
@@ -1403,6 +1406,15 @@ impl domain::ports::FederationActionPort for ActivityPubService {
             .await
             .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))
     }
+
+    async fn actor_json(
+        &self,
+        user_id: &domain::value_objects::UserId,
+    ) -> Result<String, domain::errors::DomainError> {
+        ActivityPubService::actor_json(self, &user_id.as_uuid().to_string())
+            .await
+            .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))
+    }
 }
 
 #[cfg(test)]