Add reproducible DGX Spark deployment for Qwen3.8 Flash Next NVFP4

Dockerfile

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+ARG BASE_IMAGE=vllm/vllm-openai@sha256:c4392d76e3eec8983fa152651365158cb062e348fd40398963f499d5867b9e28
+FROM ${BASE_IMAGE}
+COPY vendor/vllm_ple_mmap.py patches/spark_ngram_adapter.py /usr/local/lib/python3.12/dist-packages/
+RUN python3 - <<'PY'
+from pathlib import Path
+import ast
+root = Path('/usr/local/lib/python3.12/dist-packages/vllm')
+p = root / 'models/qwen4_exp/nvidia/ngram_embedding.py'
+s = p.read_text()
+assert 'class Qwen4ExpPLEPinnedHostEmbedding' in s
+s += '\nfrom spark_ngram_adapter import apply as _spark_disk_apply\n_spark_disk_apply(Qwen4ExpNGramEmbedding)\n'
+ast.parse(s)
+p.write_text(s)
+for file, before, after in [
+    ('third_party/flash_linear_attention/ops/utils.py', 'DEFAULT = 102400', 'DEFAULT = 101376'),
+    ('third_party/flash_linear_attention/ops/chunk_delta_h.py', 'for num_warps in [2, 4]', 'for num_warps in [2]'),
+]:
+    p = root / file
+    s = p.read_text()
+    assert before in s, file
+    p.write_text(s.replace(before, after))
+PY