remove missing soma manifests from prod kustomization

Soma moved to GCP Cloud Run. The soma-*.yaml files were deleted but
the kustomization still referenced them, blocking all Argo CD syncs
for neuron-prod (including the new allow-daemon-ingress NetworkPolicy).

servers/legion/k8s/neuron-technologies/prod/kustomization.yaml

@@ -20,9 +20,4 @@ resources:
   - hpa.yaml
   - pdb.yaml
   - network-policy.yaml
-  # Soma inference gateway
+  # Soma moved to GCP Cloud Run — these manifests are removed
-  - soma-externalsecret.yaml
-  - soma-configmap.yaml
-  - soma-deployment.yaml
-  - soma-service.yaml
-  - soma-ingressroute.yaml