feat(chart): add prometheus configuration options to values.yaml

[Dave-London]

Summary

• Adds prometheus.enabled and prometheus.externalPrometheusUrl to values.yaml
• Wires these values into the kai-config.yaml Helm template under spec.prometheus
• Users can now link an external Prometheus instance at helm install / helm upgrade time instead of needing to kubectl patch kai-config afterwards

Closes #907

Changes

File	Change
values.yaml	Added prometheus.enabled (default: false) and prometheus.externalPrometheusUrl (commented out)
templates/kai-config.yaml	Added conditional spec.prometheus block rendered when prometheus.enabled is true
tests/prometheus_test.yaml	7 new Helm unit tests covering defaults, enabled-only, external URL, and disabled-with-URL-set
CHANGELOG.md	Added entry under [Unreleased] > Added

Example Usage

# values.yaml override
prometheus:
  enabled: true
  externalPrometheusUrl: "http://prometheus-kube-prometheus-prometheus.monitoring.svc.cluster.local:9090"

Or via CLI:

helm install kai-scheduler ./deployments/kai-scheduler \
  --set prometheus.enabled=true \
  --set prometheus.externalPrometheusUrl=http://prometheus:9090

Test plan

• All existing Helm unit tests pass (53 tests)
• 7 new prometheus-specific tests pass
• helm template renders correctly with prometheus enabled + external URL
• helm template omits prometheus section with defaults (disabled)

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