[Lint] Add python/sglang to ruff F401 checks and remove unused imports in files (#11685)

python/sglang/srt/layers/quantization/modelopt_quant.py

@@ -1059,16 +1059,7 @@ class ModelOptNvFp4FusedMoEMethod(FusedMoEMethodBase):
         intermediate_size,
         num_experts,
     ):
-        from flashinfer import (
-            RoutingMethodType,
-            e2m1_and_ufp8sf_scale_to_float,
-            fp4_quantize,
-            next_positive_power_of_2,
-            nvfp4_block_scale_interleave,
-            reorder_rows_for_gated_act_gemm,
-            shuffle_matrix_a,
-            shuffle_matrix_sf_a,
-        )
+        from flashinfer import nvfp4_block_scale_interleave
         from flashinfer.fused_moe.core import (
             _maybe_get_cached_w2_permute_indices,
             _maybe_get_cached_w3_w1_permute_indices,