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/conf/server.json

@@ -0,0 +1,15 @@
+{
+  "host": "0.0.0.0",
+  "port": 8080,
+  "backend": "cuda",
+  "threads": 6,
+  "models": [
+    {
+      "id": "vibevoice-asr-streaming-1.5b",
+      "family": "vibevoice_asr_streaming",
+      "path": "/models/vibevoice-asr-streaming-1.5b-q4_k.gguf",
+      "task": "asr",
+      "mode": "streaming"
+    }
+  ]
+}