n8n: surface real per-workflow evidence on the integration status page

Fleet Ops integration status no longer depends only on a config
boolean or the most recent outbox event: N8nIntegrationStatus now
reports per-canonical-workflow evidence (last successful outbox
delivery for the return workflow, latest service-triggered
data_quality_scan_run for the scan workflow, latest
n8n_workflow_failure_registered for the error handler, and "not built"
for the still-blocked RAGcore sync), plus an error-handler summary
(total failures registered, latest failure + which workflow).

Automation page renders this as a localized workflow table (EN/NL/FR)
with technical workflow names tucked under a "Technical details"
disclosure, matching the existing progressive-disclosure pattern.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/i18n/locales/en-GB/integrations.json

@@ -26,6 +26,28 @@
     "demoMode": "Demo mode",
     "unavailable": "Unavailable"
   },
+  "workflows": {
+    "title": "Automation workflows",
+    "description": "{{known}} of {{expected}} canonical n8n workflows have live evidence of running.",
+    "notBuilt": "Not built yet",
+    "noEvidence": "No evidence yet",
+    "columns": {
+      "name": "Workflow",
+      "status": "Status",
+      "lastSeen": "Last evidence",
+      "technicalId": "Details"
+    },
+    "names": {
+      "vehicleReturn": "Vehicle return orchestration",
+      "scheduledScan": "Scheduled data quality scan",
+      "ragcoreSync": "Knowledge procedure sync",
+      "errorHandler": "Workflow error handler"
+    },
+    "errorHandler": {
+      "summary": "{{count}} automation failure(s) registered — latest from {{workflow}} at {{when}}.",
+      "summaryEmpty": "No automation failures have been registered."
+    }
+  },
   "ledger": {
     "title": "Automation jobs",
     "description": "Persisted automation attempts with the latest failure evidence.",