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新增 VLLM_V1_USE_REDUCED_TOPK_TOPP_SAMPLER 开关并补充适用场景说明

在 V1 GPU 输入批预计算 max_top_k/has_any_no_top_k，native sampler 满足条件时走 reduced fast path，异常自动回退

  - 新增环境变量 `VLLM_V1_FAST_TOKEN_ID_COPY`（默认关闭）
  - 在 `CachedRequestState` 中缓存 int32 的 prompt token ids（numpy 数组）
  - 开启后在 `InputBatch` 中使用 `np.copyto` 拷贝 prompt/output token ids

set fp8_e4m3 only supported on nmz and support q&kvcache fp8
set VLLM_PCIE_USE_CUSTOM_ALLREDUCE=1

Signed-off-by: Nick Hill <nickhill123@gmail.com>

Signed-off-by: Yifan Qiao <yifanqiao@berkeley.edu>
(cherry picked from commit a01ef3fa)

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(cherry picked from commit 0a3c71e7)

add prepare_so_files to prepare so

not supported FlashMLASchedMeta

Signed-off-by: Nick Hill <nickhill123@gmail.com>
(cherry picked from commit 0cd259b2)

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(cherry picked from commit 1f3a2c29)

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