- Update Geofabrik download URL from great-britain to united-kingdom
(old path returns 302 redirect to homepage).
- Switch OSRM Docker volumes from named volume to bind mount
(./osrm-data:/data) so osrm-setup.sh output is used directly.
- Add osrm-data/ to .gitignore (large binaries, regenerated by script).
Adds osrm-foot, osrm-bicycle, and otp services to Docker Compose under
a 'routing' profile (opt-in). Setup scripts download Greater London OSM
data and pre-process for OSRM foot/bicycle profiles, plus TfL GTFS for
OTP transit. Routing engine env vars added to .env.sample.