fix: stabilize yutong mqtt ingestion

go/vehicle-gateway/internal/gateway/mqtt_client.go

@@ -108,6 +108,8 @@ func (c *MQTTClient) buildOptions(ctx context.Context) (*mqtt.ClientOptions, err
 		SetAutoReconnect(true).
 		SetConnectRetry(true).
 		SetConnectRetryInterval(5 * time.Second).
+		SetResumeSubs(true).
+		SetOrderMatters(false).
 		SetKeepAlive(keepAlive).
 		SetConnectTimeout(connectTimeout)
 

go/vehicle-gateway/internal/gateway/mqtt_client_test.go

@@ -111,6 +111,12 @@ func TestMQTTClientBuildOptionsLoadsTLSCertificates(t *testing.T) {
 	if !opts.CleanSession {
 		t.Fatal("CleanSession should be true")
 	}
+	if opts.Order {
+		t.Fatal("OrderMatters should be false so MQTT network handling is not blocked by Kafka/DB work")
+	}
+	if !opts.ResumeSubs {
+		t.Fatal("ResumeSubs should be true to avoid subscribe failures during reconnect churn")
+	}
 	if got := opts.KeepAlive; got != 20 {
 		t.Fatalf("KeepAlive = %d, want 20", got)
 	}