Field Service - Stock Equipment Return

This module adds a "Return" order type to Field Service and links it to warehouse operations, so returning a piece of equipment is a single, guided action instead of a manual stock adjustment.

• On an equipment record, a "Create Return" button appears (for stock users) when the equipment has a current stock location or a current location. It opens a new field service order pre-filled with that equipment and the Return order type.
• On the Field Service Order Type screen, a new "Return" internal type is available; when selected, a Picking Type field becomes visible and mandatory. Only incoming picking types can be chosen.
• On a field service order of the Return type, the Equipment field becomes visible and required.

When such a return order is saved, Odoo automatically: checks that both a picking type and an equipment are set (otherwise it blocks with an error); finds the equipment's current stock location (or the inventory location of its current location, and errors out if none is found); creates a procurement group linked to the order; creates an incoming stock transfer from that location to the picking type's default destination, with one move for the equipment's product and its lot if present; and confirms the transfer.

It touches fsm.equipment, fsm.order, fsm.order.type, stock.picking, stock.move and procurement.group.