feat(jobs): add fp.job native model with state machine

Header model replacing mrp.production. mail.thread for chatter,
priority/state/deadline tracking, sequence WH/JOB/00001+. Tests
cover create, confirm, cancel, and forbidden double-confirm.

State machine:
  draft -> confirmed -> in_progress -> done
              v                          ^
          cancelled              (rework reverts here)
  on_hold can be entered from confirmed or in_progress.

Step relations come in Task 1.5; SO/recipe/portal/cost extension
fields come in Task 1.4.

Part of: native job model migration (spec 2026-04-25)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating',
-    'version': '19.0.8.1.1',
+    'version': '19.0.8.2.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Core plating / metal finishing ERP: facilities, processes, tanks, baths, jobs, operators.',
     'description': """
@@ -82,6 +82,7 @@ Copyright (c) 2026 Nexa Systems Inc. All rights reserved.
         'security/fp_security.xml',
         'security/ir.model.access.csv',
         'data/fp_sequence_data.xml',
+        'data/fp_job_sequences.xml',
         'data/fp_process_category_data.xml',
         'views/fp_process_type_views.xml',
         'views/fp_work_center_views.xml',