Motorboy V1.5.2

1. Back up files and database.
2. Keep config.php, root .htaccess, uploads/ and storage/.
3. Replace api.php, app/ and admin/.
4. If V1.5.1 migration was already run, run only migrations/1.5.2.sql.
   Otherwise run 1.5.1.sql then 1.5.2.sql.
5. Verify /api/v1/health reports 1.5.2.
6. Hard-refresh /app/ and /admin/.

After upgrade, review each branch and confirm its Departure Location.
The migration attempts to map existing branches by city automatically.
