Disable auto-sync for envoy-gateway (ArgoCD OCI bug)

ArgoCD v3.3.3 has a bug where OCI chart revision resolution
doesn't include the chart name in the Docker Hub API path,
causing 401 errors. The chart is already deployed at v1.6.3.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

argocd-apps/infrastructure/envoy-gateway.yaml

@@ -22,10 +22,10 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: envoy-gateway-system
+  # NOTE: Auto-sync disabled due to ArgoCD v3.3.3 OCI chart resolution bug
+  # (HEAD request to Docker Hub doesn't include chart name in OCI path)
+  # Re-enable after upgrading ArgoCD or when the bug is fixed
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - ServerSideApply=true