feat(fusion_plating): Office User grants Contact Creation + rack-load Phase 1 models

- group_fp_office_user now implies base.group_partner_manager so every office/
  manager role can create contacts (Technicians excluded). Fixes the live
  "create a company contact, it doesn't show" report (AccessError on save).
- New fp.rack.load + fp.rack.load.line models (multi-rack split at Racking,
  Phase 1) with sequence, ACLs, equal-split math, and tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating',
-    'version': '19.0.22.1.0',
+    'version': '19.0.23.0.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Core plating / metal finishing ERP: facilities, processes, tanks, baths, jobs, operators.',
     'description': """
@@ -93,6 +93,7 @@ Copyright (c) 2026 Nexa Systems Inc. All rights reserved.
         'data/fp_sequence_data.xml',
         'data/fp_job_sequences.xml',
         'data/fp_numbering_sequences.xml',
+        'data/fp_rack_load_sequence.xml',
         'data/fp_process_category_data.xml',
         # fp_menu.xml MUST load early — defines menu_fp_root, menu_fp_config,
         # menu_fp_compliance_hub, plus the 7 Phase-2 Configuration sub-folder