[Cherry-pick to release/v0.5.13] Fix Gemma4 NVFP4 MoE default attention backend (#26791) - #27715

[Cherry-pick to release/v0.5.13] Fix Gemma4 NVFP4 MoE default attention backend (#26791)#27715

Kangyan-Zhou merged 1 commit into

release/v0.5.13sgl-project/sglang:release/v0.5.13from

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