Clean up Dockerfile by removing unused COPY commands

Remove unnecessary config and migrations copy commands.

Author: Smaug6739

backend/Dockerfile

@@ -22,11 +22,9 @@ WORKDIR /app
 
 # Copy built application
 COPY --from=builder --chown=nonroot:nonroot /app/backend_app ./
-COPY --chown=nonroot:nonroot config.toml ./
-COPY --chown=nonroot:nonroot migrations ./migrations/
 
 # Expose port
 EXPOSE 8201
 
 # Default command
-ENTRYPOINT ["./backend_app"]
+ENTRYPOINT ["./backend_app"]