fix(reports): remove Customer Acceptance/Authorized Representative signature block from FP sale report

The signature footer ('Customer Acceptance (Signature / Date)' +
'Authorized Representative') is not part of EN Plating's intended
customer-facing quote/SO PDF flow. Removed from both portrait and
landscape variants of report_fp_sale_portrait/landscape.

Invoice report (report_fp_invoice.xml) had no such block - nothing
to remove there. Verified by grep across fusion_plating_reports.

Version bump: fusion_plating_reports 19.0.11.14.0 -> 19.0.11.15.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <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': '19.0.11.14.0',
+    'version': '19.0.11.15.0',
     'category': 'Manufacturing/Plating',
     'summary': 'PDF reports for Fusion Plating: quote, SO, WO, packing, BoL, CoC, invoice, receipt, quality + compliance.',
     'depends': [