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

python/sglang/srt/models/longcat_flash.py

@@ -44,9 +44,7 @@ from sglang.srt.distributed import (
 )
 from sglang.srt.eplb.expert_distribution import get_global_expert_distribution_recorder
 from sglang.srt.eplb.expert_location import ModelConfigForExpertLocation
-from sglang.srt.eplb.expert_location_dispatch import ExpertLocationDispatchInfo
 from sglang.srt.layers.activation import SiluAndMul
-from sglang.srt.layers.amx_utils import PackWeightMethod
 from sglang.srt.layers.communicator import LayerCommunicator, LayerScatterModes
 from sglang.srt.layers.dp_attention import (
     get_attention_tp_rank,
@@ -87,20 +85,15 @@ from sglang.srt.models.deepseek_v2 import DeepseekV2AttentionMLA
 from sglang.srt.server_args import get_global_server_args
 from sglang.srt.utils import (
     BumpAllocator,
-    LazyValue,
     add_prefix,
     bind_or_assign,
     cpu_has_amx_support,
     get_bool_env_var,
     get_device_sm,
-    get_int_env_var,
     is_cpu,
     is_cuda,
-    is_flashinfer_available,
     is_hip,
-    is_non_idle_and_non_empty,
     is_npu,
-    is_sm100_supported,
 )
 
 _is_hip = is_hip()
@@ -113,13 +106,7 @@ _is_cpu = is_cpu()
 _device_sm = get_device_sm()
 
 if _is_cuda:
-    from sgl_kernel import (
-        awq_dequantize,
-        bmm_fp8,
-        dsv3_fused_a_gemm,
-        dsv3_router_gemm,
-        merge_state_v2,
-    )
+    from sgl_kernel import awq_dequantize
 elif _is_cpu and _is_cpu_amx_available:
     pass
 elif _is_hip: