docs: 重绘分辨率对比(无美颜提示词) + 调试接口支持自定义提示词

- app.py/hairline/service.py: 调试接口新增 redraw_prompt 参数,_call_local_redraw 支持自定义提示词
- benchmark_res_prompt.py: 提示词改为"填充遮罩区域的头发,皮肤加一点磨皮"(去掉美颜)
- static/bench4_report.html: 20行×4分辨率对比报告,80/80成功,0 OOM

可对照 bench3(含美颜) vs bench4(无美颜) 看画质差异

app.py

@@ -829,6 +829,7 @@ async def debug_grow_timing(
     hair_style: str = Form(default="2", description="发型序号(花瓣=2)，逗号分隔多选"),
     webui_steps: Optional[int] = Form(default=None, description="swapHair webui img2img 采样步数，None=服务端默认(15)，可填10/15/20/25对比"),
     redraw_max_side: Optional[int] = Form(default=None, description="ComfyUI重绘分辨率(长边像素)。None=默认896；0=原图不缩；其他如640/768/1024"),
+    redraw_prompt: Optional[str] = Form(default=None, description="ComfyUI重绘提示词，None=默认'填充遮罩区域的头发，皮肤加一点磨皮，再加一点美颜'"),
 ):
     """单图跑接口2女性生发，返回每个步骤的耗时 + 结果图，用于定位性能瓶颈。
 
@@ -927,9 +928,12 @@ async def debug_grow_timing(
 
                 # 3: ComfyUI 重绘
                 t0 = _time.perf_counter()
+                # max_side: 0 或 None 都让 _call_local_redraw 用默认逻辑(外层已控制分辨率)
+                _ms = redraw_max_side if redraw_max_side is not None and redraw_max_side > 0 else None
                 grown_png = await run_in_threadpool(
                     _call_local_redraw,
-                    base64.b64decode(final_b64), base64.b64decode(mask_b64))
+                    base64.b64decode(final_b64), base64.b64decode(mask_b64),
+                    max_side=_ms, prompt=redraw_prompt)
                 entry["comfyui_redraw_ms"] = int((_time.perf_counter() - t0) * 1000)
                 if grown_png:
                     entry["grown_b64"] = "data:image/jpeg;base64," + _png_to_jpg_b64(grown_png)