fix(plating): show additional charge under subtotal on SO + invoice PDFs

Tooling/additional charge lines (any product line with no part catalog)
no longer print in the parts table — they render in the totals block
under the subtotal with their entered label + amount. Subtotal is now
parts-only; tax + grand total are unchanged (the charge is still a real
taxed line in the data). Applies to SO confirmation and invoice, both
portrait and landscape. Also aligns the invoice S/N cell to the SO's
multi-serial rendering.

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

fusion_plating/fusion_plating_reports/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Plating — Reports',
-    'version': '19.0.11.32.0',
+    'version': '19.0.11.33.0',
     'category': 'Manufacturing/Plating',
     'summary': 'PDF reports for Fusion Plating: quote, SO, WO, packing, BoL, CoC, invoice, receipt, quality + compliance.',
     'depends': [