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Introduces a new "Pro No" field to shipments, with corresponding database migration, model updates, validation, and UI integration across create, edit, and show views.

Adds the capability to generate and download Bill of Lading (BOL) PDFs for shipments, including barcodes for both BOL and Pro No values. This involves new routes, controller methods, a dedicated PDF view, and the addition of `dompdf` and `picqer/php-barcode-generator` dependencies.

The Google Sheets shipment import functionality has been fully removed, including its routes, UI elements, and backend logic. All related tests are now skipped.

Removes previously introduced organization contact fields (address lines, city, state, zip, support phone, support email) from the application settings. The `google_sheet_url` setting remains configurable as a general application setting.

Updates PHP documentation version in project guidelines.