feat(fp.certificate): ACL guard + state hooks + age field (Tasks 6-8)

action_issue gated to Manager/QM/Owner via Python AccessError +
view-level groups= on the Issue button (two-layer enforcement).
Manager bypass via fp_skip_cert_authority_gate=True context flag
with chatter audit.

action_issue post-callback calls job._fp_check_advance_after_cert_issue
so the job auto-advances awaiting_cert → awaiting_ship when every
required cert is issued.

write({'state':'voided'}) override calls
job._fp_check_regress_after_cert_void so a previously-issued cert
being voided slides the job back to awaiting_cert and re-notifies
the QM.

x_fc_age_hours non-stored Float drives the Quality Dashboard age
chip + overdue filter.

Version bump 19.0.7.9.3 → 19.0.8.0.0 (spec said 19.0.6.0.0 but
current is already higher; bumped to next major instead).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_certificates/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — Certificates',
-    'version': '19.0.7.9.3',
+    'version': '19.0.8.0.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Certificate registry for CoC, thickness reports, and quality documents.',
     'description': """