FlashInfer NVFP4 MoE with EP & 2-stream shared expert (#7327)

Co-authored-by: JieXin Liang <Alcanderian@users.noreply.github.com>
Co-authored-by: alcanderian <alcanderian@gmail.com>

python/sglang/srt/layers/moe/ep_moe/layer.py

@@ -1295,6 +1295,9 @@ class DeepEPMoE(EPMoE):
 def get_moe_impl_class():
     if global_server_args_dict["enable_deepep_moe"]:
         return DeepEPMoE
+    if global_server_args_dict["enable_flashinfer_moe"]:
+        # Must come before EPMoE because FusedMoE also supports enable_ep_moe
+        return FusedMoE
     if global_server_args_dict["enable_ep_moe"]:
         return EPMoE
     return FusedMoE