[MUSA][16/N] Add MUSA backend support for layers and DeepSeek models (V2/V3/R1) (#22774)

Co-authored-by: popsiclexu <zhenxue.xu@mthreads.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

python/sglang/srt/layers/sampler.py

@@ -16,7 +16,12 @@ from sglang.srt.layers.utils.logprob import get_token_ids_logprobs, get_top_logp
 from sglang.srt.sampling.sampling_batch_info import SamplingBatchInfo
 from sglang.srt.sampling.sampling_params import TOP_K_ALL
 from sglang.srt.server_args import get_global_server_args
-from sglang.srt.utils.common import crash_on_warnings, get_bool_env_var, is_cuda, is_npu
+from sglang.srt.utils.common import (
+    crash_on_warnings,
+    get_bool_env_var,
+    is_cuda,
+    is_npu,
+)
 
 if is_cuda():
     from flashinfer.sampling import (
@@ -27,6 +32,7 @@ if is_cuda():
         top_k_renorm_prob,
         top_p_renorm_prob,
     )
+
 if is_npu():
     import torch_npu