fix: postgres-18.yml volume should mount at /var/lib/postgresql, not /var/lib/postgresql/data

[ineedjet]

Problem

apps/postgres-18.yml mounts the data volume at /var/lib/postgresql/data:

volumes:
  - ../apps-data/${APP_NAME}/postgres:/var/lib/postgresql/data

PostgreSQL 18+ images changed the default data directory structure — they now expect the mount at /var/lib/postgresql and create a versioned subdirectory (18/main) inside it. Mounting at /var/lib/postgresql/data causes postgres to fail on startup with:

Error: in 18+, these Docker images are configured to store database data in a
       format which is compatible with "pg_ctlcluster" (specifically, using
       major-version-specific directory names).
...
Counter to that, there appears to be PostgreSQL data in:
  /var/lib/postgresql/data (unused mount/volume)

See: docker-library/postgres#1259

Fix

volumes:
  - ../apps-data/${APP_NAME}/postgres:/var/lib/postgresql

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