refactor(jobs): gate fp.job lifecycle hooks on fp_jobs_migration context

Migration script now sets context fp_jobs_migration=True before
creating fp.job records. action_confirm and button_mark_done check
this flag and skip side-effects (portal job creation, QC check,
racking inspection, delivery, certificate, notification dispatch)
when migrating.

Without this, the migration would double-create portal jobs / QC
checks / racking inspections — once via bridge_mrp's original
create on the source MO, once via jobs module's lifecycle hook on
the new fp.job mirror. With the gate, the migration script
explicitly rebinds the existing dependents via x_fc_job_id.

Manifest 19.0.2.0.0 → 19.0.2.1.0.

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_jobs/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Plating — Native Jobs',
-    'version': '19.0.2.0.0',
+    'version': '19.0.2.1.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Native plating job model — replaces mrp.production / mrp.workorder bridge.',
     'description': """