feat(nh3-ml1): LFM2.5-VL-3B (llama.cpp) + VibeVoice-ASR-Streaming-1.5B (audio.cpp) utility seats

For brokkr's dataset foundry (operator-approved 2026-09-26, relayed).
- stacks/lfm-vl-seat: llama.cpp server-cuda b11176 (digest-pinned), Q5_K_M +
  mmproj Q8_0, :8030; gateway alias lfm25-vl-3b (LiteLLM restarted, 36 s).
  Positive control exact; null control shows it describes a missing image.
- stacks/vibevoice-asr-seat: audio.cpp v0.8.2-audio8-perf-hotfix (the GGUF's
  own runtime, not vibevoice.cpp) on cuda 12.8 runtime + libgomp + libsoxr,
  sha256-pinned; :8031 direct. LibriSpeech WER 3/69, RTF 0.07-0.14; ~31 s
  cold first request.

stacks/vibevoice-asr-seat/Dockerfile

@@ -0,0 +1,16 @@
+# audio.cpp server (0xShug0/audio.cpp) for VibeVoice-ASR-Streaming on nh3-ml1.
+# The release's Linux CUDA build ("cuda12.8-colab") is a bare binary that needs the
+# CUDA 12 runtime libs (cudart, cublas, cufft, nccl) plus libgomp. This image
+# supplies them, plus libsoxr (without it audio.cpp falls back to linear
+# resampling for the 16k→24k step). Built locally on the host; not pushed.
+FROM nvidia/cuda:12.8.1-runtime-ubuntu22.04
+ARG AUDIOCPP_TAG=v0.8.2-audio8-perf-hotfix
+ARG AUDIOCPP_SHA256=ccfb35869d67e520801981392189a1ab8b6c829151093e0816ecd6a2d828d8c8
+RUN apt-get update && apt-get install -y --no-install-recommends libgomp1 libsoxr0 curl ca-certificates \
+ && rm -rf /var/lib/apt/lists/*
+RUN curl -fsSL -o /tmp/a.tgz "https://github.com/0xShug0/audio.cpp/releases/download/${AUDIOCPP_TAG}/audio-${AUDIOCPP_TAG}-bin-ubuntu-x64-cuda12.8-colab.tar.gz" \
+ && echo "${AUDIOCPP_SHA256}  /tmp/a.tgz" | sha256sum -c - \
+ && mkdir -p /app && tar xzf /tmp/a.tgz -C /app --no-same-owner && rm /tmp/a.tgz \
+ && chmod +x /app/audiocpp_server
+WORKDIR /app
+ENTRYPOINT ["/app/audiocpp_server"]