feat(reports+configurator): invoice PDF uses macro; x_fc_part_catalog_id on account.move.line (Sub 2 Task 19)

Invoice PDF (portrait + landscape) now collapses SKU + Description into
a single Part column rendered via fusion_plating_reports.customer_line_header,
so customer-facing invoices print the customer's part number (with
revision) instead of the internal service SKU.

To feed the macro on invoice lines, add x_fc_part_catalog_id to
account.move.line and override sale.order.line._prepare_invoice_line so
the part reference propagates automatically when an SO is invoiced.

fusion_plating/fusion_plating_configurator/models/__init__.py

@@ -13,6 +13,7 @@ from . import fp_sale_description_template
 from . import fp_quote_configurator
 from . import sale_order
 from . import sale_order_line
+from . import account_move_line
 from . import fp_sale_assembly
 from . import res_partner
 from . import fp_process_node

fusion_plating/fusion_plating_configurator/models/account_move_line.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+# Part of the Fusion Plating product family.
+#
+# Sub 2 Task 19 — propagate the customer part reference from SO line to
+# invoice line so customer-facing invoice PDFs can print the part number
+# via the shared fusion_plating_reports.customer_line_header macro.
+
+from odoo import fields, models
+
+
+class AccountMoveLine(models.Model):
+    _inherit = 'account.move.line'
+
+    x_fc_part_catalog_id = fields.Many2one(
+        'fp.part.catalog',
+        string='Part',
+        help="Copied from sale.order.line on invoice creation so customer-"
+             "facing invoice PDFs can render the customer's part number.",
+    )

fusion_plating/fusion_plating_configurator/models/sale_order_line.py

@@ -89,3 +89,15 @@ class SaleOrderLine(models.Model):
     def action_unarchive_line(self):
         self.write({'x_fc_archived': False})
         return True
+
+    def _prepare_invoice_line(self, **optional_values):
+        """Carry x_fc_part_catalog_id from SO line to invoice line.
+
+        Sub 2 Task 19 — lets the customer-facing invoice PDF render the
+        customer's part number via the shared customer_line_header macro
+        instead of the internal service SKU.
+        """
+        vals = super()._prepare_invoice_line(**optional_values)
+        if self.x_fc_part_catalog_id:
+            vals['x_fc_part_catalog_id'] = self.x_fc_part_catalog_id.id
+        return vals