feat(configurator): A4 - add Express header fields to sale.order

fusion_plating/fusion_plating_configurator/models/sale_order.py

@@ -121,6 +121,25 @@ class SaleOrder(models.Model):
              'each shop slices its backlog differently (customer programme, '
              'priority, week, etc.).',
     )
+
+    # ---- Express Orders header-level (2026-05-26) ----
+    x_fc_material_process = fields.Char(
+        string='Material / Process Tag',
+        help='Free-text order-level shop tag (e.g. ENP-STEEL-HP-ADVANCED). '
+             'Informational; not used by the workflow.',
+    )
+    x_fc_internal_notes = fields.Text(
+        string='Order-Level Internal Notes',
+        help='Notes visible only to the estimator / planner / shop. Never '
+             'prints on customer-facing PDFs. Distinct from sale.order.note '
+             'which IS customer-facing (Terms & Conditions).',
+    )
+    x_fc_print_terms = fields.Boolean(
+        string='Print Terms on Customer Documents',
+        default=True,
+        help='When False, the Terms & Conditions (sale.order.note) is '
+             'suppressed on quote / SO / invoice / packing slip PDFs.',
+    )
     x_fc_planned_start_date = fields.Date(
         string='Planned Start Date', tracking=True,
     )