fix: preprocess OSRM map data at runtime instead of build time

fix: move OSRM data to /osrm-data to avoid HuggingFace volume mount overwrite

fix: migrate to Alpine package manager for newer OSRM base image

fix: Switch to ghcr.io OSRM base image to resolve EOL Debian apt-get errors

fix: Use OSRM backend as runtime base image to fix missing shared libraries (exit code 127)

fix: ensure devDependencies are installed in builder stage

feat: Add backend application files for HuggingFace space