MRP Production Serial Matrix Queue Job

This module changes how the Serial Matrix validation on a manufacturing order is executed. Instead of doing all the work while the user waits, the validation is handed over to Odoo's background job queue (queue_job).

• When a user validates a Serial Matrix, the processing is automatically delayed and runs as a background job.
• Each recursive step of the serial number processing creates a new background job, so long lists of serial numbers are handled step by step without blocking the screen.
• The jobs are placed in a dedicated queue channel named mrp_production_serial_matrix, which makes them easy to find and monitor in the job queue screens.
• The job description shows the related manufacturing order name, so users can identify which order a job belongs to.
• Jobs are given a fixed priority and an exact identity key, which helps avoid duplicate jobs for the same operation.

The module extends the existing mrp.production.serial.matrix model and overrides its validation button. It does not add new menus or fields; it only changes the execution behaviour of the existing Serial Matrix feature. No new business rules, checks or reports are introduced by this code.