When a bill of materials is deleted, related byproduct records are now automatically removed as well. This prevents leftover manufacturing data and keeps product setup records clean and consistent.

Added cascade on subproduct so they get removed with parent bom

This fixes the startup instruction at the top of the main Odoo launch file so operating systems can run it with the correct Python interpreter. It is a small reliability fix that helps avoid execution issues when starting Odoo directly from the script.