Move runtime ownership into druid-cli

[MarcStdt]

Summary

• move runtime lifecycle, routing targets, and backup/restore execution into druid-cli runtime APIs
• add druid-cli Helm chart and split management/public runtime routes
• add CLI-driven Docker and Kubernetes backend integration tests with CI wiring

Verification

• make test
• make validate-api
• make build
• make test-integration

[druid-infra]

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