feat(configurator): add internal + customer-facing description fields (Sub 2 Task 2)

fusion_plating/fusion_plating_configurator/models/fp_sale_description_template.py

@@ -35,6 +35,18 @@ class FpSaleDescriptionTemplate(models.Model):
         help='Boilerplate text. The user can tweak this in the wizard before '
              'it lands on the order line.',
     )
+    # Sub 2 — dual descriptions. Added alongside the legacy `description`
+    # field; migration copies old value into both, then old column dropped
+    # in Phase C. Nullable during Phase A so existing records don't fail.
+    internal_description = fields.Text(
+        string='Internal Description',
+        help='What the shop floor sees on the WO / traveler. Never on '
+             'customer documents.',
+    )
+    customer_facing_description = fields.Text(
+        string='Customer-Facing Description',
+        help='Prints on the SO, invoice, packing slip, and BoL.',
+    )
     sequence = fields.Integer(default=10)
     part_catalog_id = fields.Many2one(
         'fp.part.catalog', string='Part',