Add vLLM v0.18.1 source tree with KV transfer abort fix

third_party/vllm/ now tracked in git for direct patch management.
Based on vLLM v0.18.1 release with one patch applied:

  vllm/v1/core/sched/scheduler.py:
    Replace fatal assert with graceful skip when KV transfer callback
    arrives for an already-aborted request during PD disaggregated serving.

Future vLLM modifications should be made directly in third_party/vllm/
and committed normally. The patches/ directory is kept as documentation
of what changed from upstream.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

third_party/vllm/requirements/nightly_torch_test.txt

@@ -0,0 +1,48 @@
+# testing
+pytest
+tensorizer==2.10.1
+pytest-forked
+pytest-asyncio
+pytest-rerunfailures
+pytest-shard
+pytest-timeout
+
+# testing utils
+backoff # required for phi4mm test
+blobfile # required for kimi-vl test
+einops # required for MPT, qwen-vl and Mamba
+httpx
+librosa # required for audio tests
+vocos # required for minicpmo_26 test
+peft
+pqdm
+ray[cgraph,default]>=2.48.0 # Ray Compiled Graph, required by pipeline parallelism tests
+sentence-transformers>=5.2.0 # required for embedding tests
+soundfile # required for audio tests
+jiwer # required for audio tests
+timm # required for internvl test
+transformers_stream_generator # required for qwen-vl test
+matplotlib # required for qwen-vl test
+mistral_common[image,audio] >= 1.9.1 # required for voxtral test
+num2words # required for smolvlm test
+opencv-python-headless >= 4.13.0 # required for video test
+datamodel_code_generator # required for minicpm3 test
+lm-eval[api]>=0.4.11 # required for model evaluation test
+mteb[bm25s]>=2, <3 # required for mteb test
+transformers==4.57.5
+tokenizers==0.22.0
+schemathesis>=3.39.15 # Required for openai schema test.
+# quantization
+bitsandbytes>=0.49.2
+buildkite-test-collector==0.1.9
+
+
+genai_perf>=0.0.8
+tritonclient>=2.51.0
+
+numba == 0.61.2 # Required for N-gram speculative decoding
+numpy
+runai-model-streamer[s3,gcs,azure]==0.15.7
+fastsafetensors>=0.2.2
+instanttensor>=0.1.5
+pydantic>=2.12 # 2.11 leads to error on python 3.13