feat(configurator): A1 - add Express Orders per-part defaults to fp.part.catalog

fusion_plating/fusion_plating_configurator/models/fp_part_catalog.py

@@ -288,6 +288,27 @@ class FpPartCatalog(models.Model):
              'wizard\'s "Save as Default" toggle is ticked.',
     )
 
+    # ---- Express Orders defaults (2026-05-26) ----
+    default_specification_text = fields.Text(
+        string='Default Specification (Customer-Facing)',
+        help='Pre-fills the Specification cell when this part is added to an '
+             'Express Order. Written here automatically on order confirm — '
+             'type once, reuse forever.',
+    )
+    default_bake_instructions = fields.Text(
+        string='Default Bake Instructions',
+        help='Pre-fills the Bake cell. Empty = bake step is skipped on every '
+             'order; non-empty = bake step runs and these instructions show '
+             'on the operator tablet.',
+    )
+    default_masking_enabled = fields.Boolean(
+        string='Default Masking Enabled',
+        default=True,
+        help='Default state of the Masking checkbox on Express Order lines. '
+             'When False, masking + de-masking recipe nodes are skipped at '
+             'job creation.',
+    )
+
     # Substrate density mapping (g/cm³) for material weight calculation
     _SUBSTRATE_DENSITY = {
         'aluminium': 2.70,