fix start_args_type

Author: zhangbilang

lightllm/server/core/objs/start_args_type.py

@@ -26,7 +26,7 @@ class StartArgs:
     mem_fraction: float = field(default=0.9)
     batch_max_tokens: Optional[int] = field(default=None)
     eos_id: List[int] = field(default_factory=list)
-    tool_call_parser: Optional[str] = field(default=None)
+    tool_call_parser: Optional[str] = field(default=None, metadata={"choices": ["llama3", "qwen25", "mistral"]})
     running_max_req_size: int = field(default=1000)
     tp: int = field(default=1)
     dp: int = field(default=1)