[Deployment] KServe ServingRuntime CRD for Kubernetes

[ishangupta-ds]

Overview

Add standardized ServingRuntime custom resource for KServe in Kubernetes clusters.

Key Deliverables

• Validate integrations/kserve/serving_runtime.yaml on GKE / EKS.
• Submit PR to kserve/kserve standard catalog (integrations/kserve/UPSTREAM_PR.md).
• Add automated health check and metrics scraping endpoints.

[ishangupta-ds]

🚀 Upstream Pull Request submitted to kserve/kserve: kserve/kserve#6073

[ishangupta-ds]

🚀 Clean Upstream Pull Request submitted to kserve/kserve: kserve/kserve#6074 (Single manifest addition, DCO signed-off)