Fix import error: Remove references to deleted functions

- Removed smart_chunk_text and get_optimal_chunk_size from imports
- These functions were removed as part of Document Type Analysis simplification
- Fixes ImportError on application startup

agents.py

@@ -5,7 +5,7 @@ import logging
 from typing import Optional, Dict, Any, List, AsyncGenerator
 import time
 
-from utils import call_openai_chat, load_pdf_text_cached, load_pdf_text_chunked, get_document_metadata, get_cached_analysis, cache_analysis, smart_chunk_text, get_optimal_chunk_size
+from utils import call_openai_chat, load_pdf_text_cached, load_pdf_text_chunked, get_document_metadata, get_cached_analysis, cache_analysis
 from utils.visual_output import VisualOutputGenerator
 from config import Config