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/tests/evals/gsm8k/configs/Qwen3-Next-FP8-EP2.yaml

@@ -0,0 +1,10 @@
+model_name: "Qwen/Qwen3-Next-80B-A3B-Instruct-FP8"
+accuracy_threshold: 0.85
+num_questions: 1319
+num_fewshot: 5
+server_args: >-
+  --max-model-len 4096
+  --tensor-parallel-size 2
+  --enable-expert-parallel
+  --async-scheduling
+  --moe-backend=flashinfer_trtllm