feat: fuse post-attention all-reduce and RMSNorm - #1405
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融合 post-attention 的 all-reduce、residual add 和 ffn RMSNorm，使用 FlashInfer
kARResidualRMSNorm；不满足 fast path 条件时沿用原有实现。新增
--disable_fused_allreduce_norm便于 A/B。验证：H200、Qwen3.5-27B、TP=4、FA3、512 input / 256 output。流式输出吞吐从 135.28 提升到 137.62 tok/s（并发 1，+1.7%），从 770.10 提升到 807.04 tok/s（并发 8，+4.8%）。