feat: Make OCR and task concurrency configurable

docreader/parser/parser.py

@@ -1,4 +1,5 @@
 import logging
+import os
 from typing import Dict, Type
 
 from docreader.models.document import Document
@@ -109,8 +110,9 @@ class Parser:
             separators=config.separators,  # Text separators for chunking
             enable_multimodal=config.enable_multimodal,  # Enable image/multimodal processing
             max_image_size=1920,  # Limit image size to 1920px for performance
-            max_concurrent_tasks=5,  # Limit concurrent tasks to 5 to avoid resource exhaustion
             chunking_config=config,  # Pass the entire chunking config for advanced options
+            max_concurrent_tasks=int(os.getenv("IMAGE_MAX_CONCURRENT", "1")),
+            ocr_backend=os.getenv("OCR_BACKEND", "paddle"),
         )
 
         logger.info(f"Starting to parse file content, size: {len(content)} bytes")
@@ -155,8 +157,9 @@ class Parser:
             separators=config.separators,  # Text separators for chunking
             enable_multimodal=config.enable_multimodal,  # Enable image/multimodal processing
             max_image_size=1920,  # Limit image size to 1920px for performance
-            max_concurrent_tasks=5,  # Limit concurrent tasks to avoid resource exhaustion
             chunking_config=config,  # Pass the entire chunking config
+            max_concurrent_tasks=int(os.getenv("IMAGE_MAX_CONCURRENT", "1")),
+            ocr_backend=os.getenv("OCR_BACKEND", "paddle"),
         )
 
         logger.info("Starting to parse URL content")