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Signed-off-by: Graham King <grahamk@nvidia.com>

Co-authored-by: Yan Ru Pei <yanrpei@gmail.com>

Signed-off-by: Yan Ru Pei <yanrpei@gmail.com>
Co-authored-by: Alec <35311602+alec-flowers@users.noreply.github.com>

The Python bindings use the default value for RouterMode. Previously that was Random (good), but now it became None (bad).

Remove the option and clean up the duplicate RouterMode. I was trying to avoid putting the `KV` enum in dynamo-runtime. Turns out adding those two characters gives us a healthy simplification, and restores the old default router value.

Also clean up two noisy log messages when waiting for KV routing metrics to start in worker.

Router:
```
dynamo-run in=http out=dyn://dynamo.endpoint.generate --router-mode kv
```

Worker (* N):
```
dynamo-run in=dyn://dynamo.endpoint.generate out=vllm /data/llms/Qwen/Qwen3-4B
```

You need patched vllm and the C bindings `.so`. Full docs in the updated guide: `docs/guides/dynamo_run.md`.

This gives us a pure-Rust ingress node: OpenAI compliant HTTP server + Pre-processor + KV-aware router.

Co-authored-by: Biswa Panda <biswa.panda@gmail.com>