vlm: refactor engine vlm params and support processor output as input (#14091)

Co-authored-by: Mick <mickjagger19@icloud.com>
Co-authored-by: zhaochenyang20 <zhaochenyang20@gmail.com>
Co-authored-by: Xinyuan Tong <115166877+JustinTong0323@users.noreply.github.com>
Co-authored-by: BenYao21 <cyao22@asu.edu>
Co-authored-by: minleminzui <minleminzui@gmail.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: 赵晨阳 <zhaochen20@outlook.com>

python/sglang/test/run_eval.py

@@ -39,7 +39,7 @@ def run_eval_once(args, base_url: str, eval_obj: Eval) -> dict:
         base_url=base_url,
         temperature=getattr(args, "temperature", 0.0),
         reasoning_effort=getattr(args, "reasoning_effort", None),
-        extra_body=thinking_kwargs,
+        extra_body=thinking_kwargs if thinking_kwargs else None,
     )
 
     # Run eval