feat(vanity-gateway): pass the LLM Gateway endpoint through the stack

[Max-NV]

Why

The self-managed stack does not pass the Vanity Gateway's config block through wholesale. It enumerates the keys one at a time when rendering chart values, so llmGatewayEndpoint was dropped even after #1025 added it to the chart.

The mappingConfig half of the values does pass through untouched. The result is that an operator can mark an openai model with functionType: LLM and have the mapping land correctly, while the endpoint the gateway needs to act on it never arrives, so the container fails at startup with LLM_GATEWAY_ENDPOINT is required when a model sets functionType LLM.

What changed

Adds llmGatewayEndpoint to the rendered vanityGateway.config block in global.yaml.gotmpl, defaulted to the in-cluster LLM Gateway service, and documents it in base.yaml next to the other Vanity Gateway config keys.

Customer Release Notes

Self-managed installs can now configure the Vanity Gateway's LLM Gateway endpoint.

Plan Summary

One additional key in the values rendered for the vanity-gateway release. No resource changes for installs that do not use LLM-routed models.

Usage

addons:
  vanityGateway:
    config:
      llmGatewayEndpoint: http://llm-api-gateway.nvcf.svc.cluster.local:8080

Models that set functionType: LLM also need addons.llm.enabled, which deploys the LLM Gateway.

Testing

Rendered the self-managed stack and confirmed the key reaches the chart values.

Not covered by the end-to-end run recorded on #1022. That cluster ran the chart installed
directly from the working tree rather than through the stack, so this rendering path was not
exercised live. The value it needs to produce is the same one that run used.

No QA needed.

Notes

Chart and image pins are not bumped here. Both need a published artifact carrying the #1022 service change, which does not exist yet.

Stacked on #1025, which adds the chart key. Merging this first would break installs: the chart config block is additionalProperties: false, so it would reject the value the stack now sends. Base is set to that branch and will retarget to main when it merges.

References

None

Related Pull Requests

• feat(vanity-gateway): serve LLM Gateway routes on configured hosts #1022 is the service change
• feat(vanity-gateway): add the LLM Gateway endpoint chart knob #1025 adds the chart key this sets

Dependencies

None

Issues

Relates to #1021

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