chore: 精简生发提示词，去掉磨皮/美颜要求

统一改为「填充遮罩区域的头发」，涉及后端默认值、ComfyUI 工作流 JSON、
测试页、benchmark 脚本、local_test。

Co-authored-by: Cursor <cursoragent@cursor.com>

benchmark_rotation.py

@@ -89,7 +89,7 @@ def call_api2(image_path, gender, hair_style="1"):
     with open(image_path, "rb") as f:
         img_data = f.read()
     fields = {"gender": gender, "hair_style": hair_style, "use_mask": "0",
-              "prompt": "填充遮罩区域的头发，皮肤加一点磨皮，再加一点美颜"}
+              "prompt": "填充遮罩区域的头发"}
     body, boundary = _multipart(fields, {"image_file": (os.path.basename(image_path), img_data, "image/jpeg")})
     req = urllib.request.Request(f"{API_BASE}/api/v1/hair/grow", data=body, method="POST")
     req.add_header("Content-Type", f"multipart/form-data; boundary={boundary}")
@@ -107,7 +107,7 @@ def call_api3(image_path):
     """接口3：B端生发（use_mask=False，直接送图）"""
     with open(image_path, "rb") as f:
         img_data = f.read()
-    fields = {"use_mask": "true", "prompt": "填充遮罩区域的头发，皮肤加一点磨皮，再加一点美颜"}
+    fields = {"use_mask": "true", "prompt": "填充遮罩区域的头发"}
     body, boundary = _multipart(fields, {"marked_image_file": (os.path.basename(image_path), img_data, "image/jpeg")})
     req = urllib.request.Request(f"{API_BASE}/api/v1/hair/grow-b", data=body, method="POST")
     req.add_header("Content-Type", f"multipart/form-data; boundary={boundary}")