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feat(v1 attention): 为 ROCm FlashAttention 接入 unified kv layout，并打通 mm_prefix、qq_bias 与 use_alibi_sqrt 透传
在 ROCm FlashAttention 后端增加 unified KV layout 选择逻辑
接入 unified varlen kernel 调用路径
在 FlashAttention metadata 中补充 mm_prefix_range 与 qq_bias 透传

关闭sparse_mla的num_head到64/128的pad，以及添加控制fp8_use_mixed_batch模式的环境变量控制，FP8_USE_MIXED_BATCH，默认为false，为分离模式

- Add VLLM_V1_USE_FA_UNIFIED_ATTN_2D 环境变量
- 0: Triton attention, 1: FA unified attention

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

Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>
Signed-off-by: Lucas Wilkinson <LucasWilkinson@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Michael Goin <mgoin64@gmail.com>
(cherry picked from commit 0a3c71e7)

add prepare_so_files to prepare so

not supported FlashMLASchedMeta

Signed-off-by: NickLucche <nlucches@redhat.com>
(cherry picked from commit 1f3a2c29)

Signed-off-by: sstamenk <strahinja.stamenkovic@amd.com>

Signed-off-by: ElizaWszola <ewszola@redhat.com>
Signed-off-by: mgoin <mgoin64@gmail.com>
Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>
Signed-off-by: Luka Govedič <luka.govedic@gmail.com>
Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>
Signed-off-by: Luka Govedič <ProExpertProg@users.noreply.github.com>
Signed-off-by: Luka Govedič <lgovedic@redhat.com>
Co-authored-by: mgoin <mgoin64@gmail.com>
Co-authored-by: Varun Sundar Rabindranath <varunsundar08@gmail.com>
Co-authored-by: Matthew Bonanni <mbonanni@redhat.com>
Co-authored-by: Luka Govedič <ProExpertProg@users.noreply.github.com>
Co-authored-by: Luka Govedič <luka.govedic@gmail.com>
Co-authored-by: Lucas Wilkinson <lwilkins@redhat.com>
Co-authored-by: Luka Govedič <lgovedic@redhat.com>

Signed-off-by: marksverdhei <marksverdhei@hotmail.com>
Signed-off-by: Markus / Mark <46672778+marksverdhei@users.noreply.github.com>
Signed-off-by: mgoin <mgoin64@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: mgoin <mgoin64@gmail.com>

Signed-off-by: huanghaoyan.hhy <huanghaoyan.hhy@alibaba-inc.com>
Signed-off-by: Chen Zhang <zhangch99@outlook.com>
Co-authored-by: Chen Zhang <zhangch99@outlook.com>

Signed-off-by: Tianshu Yu <tianshuyu.formal@gmail.com>

Signed-off-by: NickLucche <nlucches@redhat.com>

Signed-off-by: Andreas Karatzas <akaratza@amd.com>

Signed-off-by: yewentao256 <zhyanwentao@126.com>

Signed-off-by: Eldar Kurtic <8884008+eldarkurtic@users.noreply.github.com>
Signed-off-by: eldarkurtic <8884008+eldarkurtic@users.noreply.github.com>

Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>

Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>

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

Signed-off-by: elvischenv <219235043+elvischenv@users.noreply.github.com>