REFACTOR: Renamed main.py to pdf_utils.py and updated Dockerfile/imports accordingly.

app.py

@@ -1,6 +1,6 @@
 import streamlit as st
 from merged import load_model_and_tokenizer, generate_code_stream
-from code_analysis.pdf_utils import test_case   
+from pdf_utils import test_case   
 
 st.write("🚀 App started")
 # ---------------- Load model ONCE ----------------