Empty containers loaded onto an export departure carry no booking and no
wagon allocation, so their wagons printed as EMPTY — no cargo allocated —
staff checking the paper against the consist found boxes the list denied.
Those wagons now print the container numbers with cargo type EMPTY
CONTAINER, count toward the 40ft/20ft tallies, and get their own summary
tile; only genuinely bare wagons keep the empty wording.
New logo-settings module (mirrors stamp-settings): single uploaded logo,
stored via FilesService/MinIO, injected as a data URL into invoice/receipt,
contract, warehouse, train-scheduling, and payment-receipt PDFs. Adds a
matching backoffice settings page and settings:logo:view/manage permissions.
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