refactor(magic_pdf): adjust confidence threshold for DocLayout_YOLO model

- Changed the confidence threshold from0.15 to 0.25 in the DocLayout_YOLO model prediction
- This adjustment aims to improve the accuracy of layout detection by filtering out low-confidence predictions

magic_pdf/model/pdf_extract_kit.py

@@ -314,7 +314,7 @@ class CustomPEKModel:
         elif self.layout_model_name == MODEL_NAME.DocLayout_YOLO:
             # doclayout_yolo
             layout_res = []
-            doclayout_yolo_res = self.layout_model.predict(image, imgsz=1024, conf=0.15, iou=0.45, verbose=True, device=self.device)[0]
+            doclayout_yolo_res = self.layout_model.predict(image, imgsz=1024, conf=0.25, iou=0.45, verbose=True, device=self.device)[0]
             for xyxy, conf, cla in zip(doclayout_yolo_res.boxes.xyxy.cpu(), doclayout_yolo_res.boxes.conf.cpu(), doclayout_yolo_res.boxes.cls.cpu()):
                 xmin, ymin, xmax, ymax = [int(p.item()) for p in xyxy]
                 new_item = {