PRINTING PRESS BARCODE LABEL UPDATE

What changed:
1. Added Container Management > Printing Press Labels.
2. You can generate up to 50,000 generic barcode labels in one batch.
3. Labels print barcode only; no 20L, 21.5L, 350ml, or 750ml text is printed.
4. During Production Entry, choose the real product/container type and scan/paste the labels as External Barcodes.
5. The system assigns the scanned generic label to the selected container type and keeps barcode history.

Important file:
- database_update_preprinted_barcodes.sql
Run it once in phpMyAdmin if the old database blocks unassigned labels. The PHP helper also attempts the same table adjustment automatically.

Main links:
- index.php?page=cm_barcode_preprint
- index.php?page=cm_container_barcodes
- index.php?page=production_receive
