improve the OCR pipeline processing and outputs formatting

src/ocr_pipeline/postprocess/chunk.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 from dataclasses import dataclass
 from typing import Any
 
-from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain_text_splitters import RecursiveCharacterTextSplitter
 
 from ocr_pipeline.config import settings
 from ocr_pipeline.utils.logging import get_logger