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/examples/template_falcon.jinja

@@ -0,0 +1,15 @@
+{%- for message in messages -%}
+    {%- if message['role'] == 'user' -%}
+        {{- 'User: ' + message['content'] -}}
+    {%- elif message['role'] == 'assistant' -%}
+        {{- 'Assistant: ' + message['content'] -}}
+    {%- endif -%}
+    {%- if (loop.last and add_generation_prompt) or not loop.last -%}
+        {{- '\n' -}}
+    {%- endif -%}
+{%- endfor -%}
+
+
+{%- if add_generation_prompt and messages[-1]['role'] != 'assistant' -%}
+    {{- 'Assistant:' -}}
+{% endif %}