feat(helm): Make service type configurable and add optional Ingress resource (resolves #2049).

[junhaoliao]

Description

Make the Kubernetes Service type configurable for externally-accessible services (Web UI, API
server, log ingestor, MCP server) and add an optional Ingress resource for production deployments
behind a load balancer.

Previously, these 4 services were hardcoded to NodePort. Cloud Kubernetes deployments
(EKS/GKE/AKS) conventionally use ClusterIP services behind an Ingress controller, which was not
possible without post-render patching.

Changes:

• Add a serviceType key to clpConfig.webui, clpConfig.api_server, clpConfig.log_ingestor,
  and clpConfig.mcp_server in values.yaml, defaulting to "NodePort" (preserving existing
  behavior).
• Update the 4 service templates to use serviceType and conditionally include nodePort only
  when serviceType is "NodePort".
• Add a new ingress.yaml template that creates an optional Ingress resource when
  ingress.enabled is true, routing / to webui and /api to api-server.
• Add an ingress section in values.yaml (disabled by default) with className, host,
  annotations, and tls configuration.
• Update docs with a new "Service types and Ingress" section.

Database and results-cache services remain controlled by allowHostAccessForSbinScripts (unchanged)
since they should only ever be NodePort (for sbin/ script access) or headless ClusterIP.

Documentation updates

File	Change
docs/src/user-docs/guides-k8s-deployment.md	Added "Service types and Ingress" section with ClusterIP + Ingress and custom NodePort examples.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

TBA

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