feat(kafka): add consumer group backlog view

crates/dbx-web/src/main.rs

@@ -181,6 +181,7 @@ fn add_mq_routes(router: Router<Arc<WebState>>) -> Router<Arc<WebState>> {
         .route("/mq/messages/trace", post(routes::mq::query_message_trace))
         .route("/mq/subscriptions/list", post(routes::mq::list_subscriptions))
         .route("/mq/subscriptions/enrich", post(routes::mq::enrich_subscriptions))
+        .route("/mq/kafka/consumer-groups", post(routes::mq::get_kafka_consumer_group_snapshot))
         .route("/mq/subscriptions/create", post(routes::mq::create_subscription))
         .route("/mq/subscriptions/delete", post(routes::mq::delete_subscription))
         .route("/mq/subscriptions/skip-messages", post(routes::mq::skip_messages))

crates/dbx-web/src/routes/mq.rs

@@ -763,6 +763,18 @@ pub async fn enrich_subscriptions(
     Ok(Json(result))
 }
 
+pub async fn get_kafka_consumer_group_snapshot(
+    State(state): State<Arc<WebState>>,
+    headers: HeaderMap,
+    Json(req): Json<ConnReq>,
+) -> Result<Json<dbx_core::mq::KafkaConsumerGroupSnapshot>, AppError> {
+    super::mcp_policy::ensure_scope(&state, &headers, &req.connection_id).await?;
+    let result = dbx_core::mq::service::mq_get_kafka_consumer_group_snapshot_core(&state.app, &req.connection_id)
+        .await
+        .map_err(AppError::from)?;
+    Ok(Json(result))
+}
+
 pub async fn create_subscription(
     State(state): State<Arc<WebState>>,
     headers: HeaderMap,