feat(domain): RemoteActor fields, RemoteNote, FetchRemoteActorPosts event, fetch_outbox_page port

crates/domain/src/testing.rs

@@ -567,6 +567,14 @@ impl FederationActionPort for TestStore {
     ) -> Result<String, DomainError> {
         Err(DomainError::NotFound)
     }
+
+    async fn fetch_outbox_page(
+        &self,
+        _outbox_url: &str,
+        _page: u32,
+    ) -> Result<Vec<crate::models::remote_note::RemoteNote>, DomainError> {
+        Ok(vec![])
+    }
 }
 
 #[async_trait]
@@ -833,6 +841,16 @@ mod federation_port_tests {
         let err = store.actor_json(&UserId::new()).await.unwrap_err();
         assert!(matches!(err, DomainError::NotFound));
     }
+
+    #[tokio::test]
+    async fn test_store_fetch_outbox_returns_empty() {
+        let store = TestStore::default();
+        let notes = store
+            .fetch_outbox_page("https://example.com/outbox", 1)
+            .await
+            .unwrap();
+        assert!(notes.is_empty());
+    }
 }
 
 #[cfg(test)]