delivery_carrier_shipping_label

Purpose

Provide a carrier-agnostic way to store and manage shipping labels as dedicated attachments on stock pickings.

Features

shipping.label: Introduces a model inheriting ir.attachment to flag shipping labels with file type defaults and optional package linkage.
delivery.carrier: Extends send_shipping to capture labels returned by carrier integrations and route them to the related pickings.
stock.picking: Supplies helper methods to attach shipping labels, sanitize attachment context, and ensure duplicate labels are prevented.