fix: replace deprecated ElevenLabs model in run examples

[felixsanz]

The audio inference example used `elevenlabs:1@1`, which the API now rejects with `invalidModel` since the ElevenLabs models were deactivated on June 18, 2026. Copying the example gave users a hard error.

Replaced it with `runware:ace-step@v1.5-turbo`, verified against the API with a dry-run request.

`steps=8` is included because ace-step accepts steps 1-20 but reports a default of 100, so omitting it fails with `invalidSteps`. That default looks like a backend bug and is worth a separate ticket.

Both the cobra example in `internal/cmd/run/run.go` and the generated `docs/runware_run.md` are updated

[coderabbitai]

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