fix: Update import path for BBoxExtractor in coordinate_utils.py

- Changed the import statement for BBoxExtractor from the merger module to ocr_utils for improved module organization and accessibility.

ocr_tools/universal_doc_parser/core/coordinate_utils.py

@@ -15,9 +15,9 @@ from typing import Dict, List, Any, Optional, Tuple, Union
 import numpy as np
 from loguru import logger
 
-# 导入 merger 组件
+# 从 ocr_utils 导入 BBoxExtractor
 try:
-    from merger import BBoxExtractor
+    from ocr_utils import BBoxExtractor
     MERGER_AVAILABLE = True
 except ImportError:
     MERGER_AVAILABLE = False