Rename app.py to main.py to force complete rebuild

- Rename main application file
- Update Dockerfile to use main.py
- This should bypass any caching issues

Dockerfile

@@ -20,9 +20,9 @@ RUN pip install --no-cache-dir --upgrade pip
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application code
-COPY --chown=user app.py .
+COPY --chown=user main.py .
 
 EXPOSE 7860
 
 # Start the application
-CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]