Update Dockerfile

Dockerfile

@@ -22,7 +22,7 @@ RUN pip install --no-cache-dir --upgrade pip && \
     pip install --no-cache-dir -r requirements.txt
 
 # Copy application code
-COPY main.py .
+COPY app.py .
 
 # Create non-root user for security
 RUN useradd --create-home --shell /bin/bash app && \
@@ -37,4 +37,4 @@ HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
     CMD curl -f http://localhost:8000/ || exit 1
 
 # Run the application
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000"]