[Bugfix] Allow flashinfer_cutlass as a clamped NVFP4 MoE backend (#46492)

Signed-off-by: Zihua Wu <13583761+lucifer1004@users.noreply.github.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Michael Goin <mgoin64@gmail.com>

vllm/model_executor/layers/fused_moe/oracle/nvfp4.py

@@ -174,6 +174,7 @@ def select_nvfp4_moe_backend(
 
     NVFP4_BACKENDS_WITH_CLAMP = {
         NvFp4MoeBackend.FLASHINFER_TRTLLM,
+        NvFp4MoeBackend.FLASHINFER_CUTLASS,
         NvFp4MoeBackend.MARLIN,
     }