[Build][CPU] Install Run:ai Model Streamer in vllm-openai-cpu image (#61382)

Signed-off-by: Denis Khachyan <khachyanda@gmail.com>
Co-authored-by: Claude Code <noreply@anthropic.com>

docker/Dockerfile.cpu

@@ -465,7 +465,7 @@ WORKDIR /vllm-workspace
 RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=cache,target=/root/.cache/ccache \
     --mount=type=bind,from=vllm-build,src=/vllm-workspace/dist,target=dist \
-    uv pip install "$(realpath dist/*.whl)[audio,bench]"
+    uv pip install "$(realpath dist/*.whl)[audio,bench,runai]"
 
 # Add labels to document build configuration
 LABEL org.opencontainers.image.title="vLLM CPU"