Enable more configurable values

[Tzvonimir]

Summary

• Extract hardcoded values (container images, resource limits, ports, replicas, probe configs, Prometheus settings) from zxporter and zxporter-netmon Helm chart templates into values.yaml
• Makes deployments configurable without modifying templates — operators can now override images, resource requests/limits, ports, retention, scrape intervals, and replica counts via standard Helm value overrides

Changes

zxporter chart:

• Added new values.yaml sections: resources, nodeExporter, kubeStateMetrics, prometheus
• Templated node-exporter-daemonset.yaml: image, pull policy, port, resources, hostNetwork, hostPID
• Templated prometheus-deployments.yaml: images, pull policies, replicas, resources, retention for kube-state-metrics, config-reloader, and prometheus server
• Templated prometheus-configmap.yaml: evaluation_interval, scrape_interval, scrape_timeout
• Templated prometheus-services.yaml: node-exporter service port
• Templated deployment.yaml: controller resources

zxporter-netmon chart:

• Added containerPort to values.yaml under config
• Templated containerPort in daemonset.yaml

Test plan

• helm template renders identical output to pre-change templates (verified — only cosmetic YAML serialization differences: key ordering, quote removal)
• helm lint passes on both charts with no errors
• Verify overriding individual values (e.g. --set prometheus.replicas=2, --set nodeExporter.port=9102) renders correctly
• Deploy to a test cluster and confirm all components start successfully