feat(plating): bilingual EN/FR column titles on the CoC

Make every CoC classic-body column title bilingual — English (bold) over
the French translation (italic grey), matching Steelhead and the SO
report's stacked-header convention. Cert-info headers (Date of
Certification / Generated By / Work Order #) and line-item headers
(Process / Customer PO / Shipped / NC Qty / Customer Job No.) now show
both languages. First column carries Part Number / Line Item,
Description, and Serial Number, each translated. Bump reports 19.0.11.29.0.

Deployed + render-verified on entech (CoC-30065, 224KB).

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': '19.0.11.28.2',
+    'version': '19.0.11.29.0',
     'category': 'Manufacturing/Plating',
     'summary': 'PDF reports for Fusion Plating: quote, SO, WO, packing, BoL, CoC, invoice, receipt, quality + compliance.',
     'depends': [