Qwen3-Next support (#10233)

Co-authored-by: cao1zhg <114661107+cao1zhg@users.noreply.github.com>
Co-authored-by: ispobock <ispobaoke@gmail.com>
Co-authored-by: Binyao Jiang <byjiang1996@gmail.com>
Co-authored-by: hebiao064 <hebiaobuaa@gmail.com>
Co-authored-by: Lifu Huang <lifu.hlf@gmail.com>
Co-authored-by: qingquansong <ustcsqq@gmail.com>
Co-authored-by: Yaoyao Ding <dingyaoyao.cs@gmail.com>
Co-authored-by: Ke Bao <ISPObaoke@163.com>
Co-authored-by: Minglei Zhu <mingleizhu1122@gmail.com>

python/sglang/srt/configs/model_config.py

@@ -147,6 +147,9 @@ class ModelConfig:
         ):
             self.hf_config.architectures[0] = "Ernie4_5_MoeForCausalLMMTP"
 
+        if is_draft_model and self.hf_config.architectures[0] == "Qwen3NextForCausalLM":
+            self.hf_config.architectures[0] = "Qwen3NextForCausalLMMTP"
+
         # Check model type
         self.is_generation = is_generation_model(
             self.hf_config.architectures, is_embedding