yaml: set sandbox router namespace to default

[ningmingxiao]

What this PR does / why we need it:

use doc:
https://github.com/kubernetes-sigs/agent-sandbox/blob/main/examples/quickstart/README.md#31-create-dedicated-namespacehttps://github.com/kubernetes-sigs/agent-sandbox/blob/main/examples/quickstart/README.md#31-create-dedicated-namespace

kubectl config set-context --current --namespace=agent-sandbox-demo
and then create sandbox_router.yaml will create at namespace agent-sandbox-demo.

Which issue(s) this PR is related to:

Release Note

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[k8s-ci-robot]

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[Copilot]

Pull request overview

This PR updates the Python sandbox-router Kubernetes manifest to explicitly set metadata.namespace: default for the Service and Deployment. The intent (per PR description) is to prevent the router from being created in whatever namespace the user has set as their current context.

Changes:

• Set metadata.namespace: default on the Service in sandbox_router.yaml.
• Set metadata.namespace: default on the Deployment in sandbox_router.yaml.