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/MANIFEST.in

@@ -0,0 +1,9 @@
+include LICENSE
+include requirements/common.txt
+include requirements/cuda.txt
+include requirements/rocm.txt
+include requirements/cpu.txt
+include CMakeLists.txt
+
+recursive-include cmake *
+recursive-include csrc *