[DSV4.1] Four BS=1 critical-path fixes for DSpark decode (887.10 -> 905.40 tok/s on 4xGB300) - #39301

[DSV4.1] Four BS=1 critical-path fixes for DSpark decode (887.10 -> 905.40 tok/s on 4xGB300)#39301

BBuf wants to merge 4 commits into

sgl-project:dsv4.1sgl-project/sglang:dsv4.1from

BBuf:bbuf/dsv41-bs1-dspark-optBBuf/sglang:bbuf/dsv41-bs1-dspark-optCopy head branch name to clipboard