【Feature】add fd plugins && rm model_classes (#3123)

* add fd plugins && rm model_classed

* fix reviews

* add docs

* fix

* fix unitest ci

fastdeploy/model_executor/models/qwen3.py

@@ -334,6 +334,10 @@ class Qwen3PretrainedModel(PretrainedModel):
         """
         return None
 
+    @classmethod
+    def arch_name(self):
+        return "Qwen3ForCausalLM"
+
     @classmethod
     def _get_tensor_parallel_mappings(cls, config, is_split=True):