feat: implement remote unfollow — wire FederationActionPort through delete_follow handler

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

@@ -1418,6 +1418,21 @@ impl domain::ports::FederationActionPort for ActivityPubService {
             .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))
     }
 
+    async fn unfollow_remote(
+        &self,
+        local_user_id: &domain::value_objects::UserId,
+        handle: &str,
+    ) -> Result<(), domain::errors::DomainError> {
+        let data = self.federation_config.to_request_data();
+        let remote_actor: DbActor = webfinger_resolve_actor(handle, &data).await.map_err(|e| {
+            domain::errors::DomainError::ExternalService(anyhow::anyhow!("{e}").to_string())
+        })?;
+        let actor_url = remote_actor.ap_id.to_string();
+        self.unfollow(local_user_id.as_uuid(), &actor_url)
+            .await
+            .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))
+    }
+
     async fn actor_json(
         &self,
         user_id: &domain::value_objects::UserId,