HYPERFLEET-439 - feat: add external API access documentation and example

[ciaranRoche]

Summary

Add support for exposing the HyperFleet API externally via LoadBalancer service type.

• Document service.type option in hyperfleet-gcp values
• Add External API Access section to README
• Create example values file for external access

Changes

• charts/hyperfleet-gcp/values.yaml - Added service.type configuration with LoadBalancer documentation
• README.md - Added "External API Access" configuration section
• examples/gcp-pubsub-external/values.yaml - New example for external API access

Usage

1. Apply terraform with enable_external_api=true (see hyperfleet-infra PR)
2. Deploy with LoadBalancer:

   helm install hyperfleet charts/hyperfleet-gcp \
     -f examples/gcp-pubsub-external/values.yaml \
     -n hyperfleet-system --create-namespace

3. Get external IP:

   kubectl get svc -n hyperfleet-system hyperfleet-hyperfleet-api

Test plan

• LoadBalancer service created with external IP
• API accessible from outside cluster at http://EXTERNAL_IP:8000

Related

• Requires: HYPERFLEET-439 - feat: add external API access via LoadBalancer hyperfleet-infra#6

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