fix(self-managed): correct worker discovery endpoint

[along-2017]

TL;DR

Backport #1989 to the self-managed 1.0 release. When backend routing is enabled, worker discovery now defaults to the backend-router service and its separately configurable gRPC port.

Additional Details

• Keep the request-router service as the default when backend routing is disabled.
• Document both defaults and cover them with render and BDD wiring tests.

For the Reviewer

• Merge this after feat(self-managed): record the installed stack version in-cluster, and let the 1.0 train ship it #2012 updates the 1.0 release branch.

For QA

• deploy/stacks/self-managed/tests/llm-router-worker-address.sh and api-env-wiring.sh passed.
• go test -short ./... passed in tests/bdd.

Issues

Relates to #1990

Checklist

• I am familiar with the Contributing Guidelines.
• I have signed off my commits for Developer Certificate of Origin (DCO) compliance.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[balajinvda]

This PR is included in version 1.0.1.

The release is available on GitHub release.