fix: remove redundant knative domain mapping

deploy/20-deployment.yaml

@@ -38,20 +38,6 @@ spec:
             requests: {cpu: 50m, memory: 128Mi}
             limits: {cpu: 200m, memory: 256Mi}
 ---
-apiVersion: serving.knative.dev/v1beta1
-kind: DomainMapping
-metadata:
-  name: test-helper.a2acloud.io
-  namespace: agents
-  labels:
-    app: test-helper
-    a2a/managed-by: control-plane
-spec:
-  ref:
-    apiVersion: serving.knative.dev/v1
-    kind: Service
-    name: test-helper
----
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata: