fix(plating): trim default SO order-line columns to the plating set

Default-hide six order-line columns that aren't part of the plating
view (Product/product_template_id, Description Template, Specification,
Delivered Qty, Invoiced Qty, Taxes) by flipping them to optional="hide".
They stay available via the optional-columns toggle. Default-visible set
is now Customer-Facing, Part, Process/Recipe, Thickness, Serial, Job #,
Effective Deadline, Qty, Unit, Unit Price, Amount — for both quotations
and sales orders.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

fusion_plating/fusion_plating_quality/views/sale_order_views_inherit.xml

@@ -33,7 +33,7 @@
                 <field name="x_fc_customer_spec_id"
                        string="Specification"
                        options="{'no_quick_create': True}"
-                       optional="show"/>
+                       optional="hide"/>
             </xpath>
         </field>
     </record>