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/data/integrationLabels.ts

@@ -17,3 +17,13 @@ export const MCP_STATE_META: Record<IntegrationStatus["mcp_hub"]["state"], { sta
   not_configured: { statusClass: "not_configured", labelKey: "notConnected" },
   configured: { statusClass: "no_events", labelKey: "prepared" },
 };
+
+// Maps the backend's canonical n8n workflow name (see n8n/workflows/MANIFEST.md) to a
+// stable slug for localized display names in `integrations:workflows.names.*` — the
+// backend name itself is a technical identifier, not something to show untranslated.
+export const N8N_WORKFLOW_SLUGS: Record<string, string> = {
+  "Fleet Ops — Vehicle Return Orchestration": "vehicleReturn",
+  "Fleet Ops — Scheduled Data Quality Scan": "scheduledScan",
+  "Fleet Ops — RAGcore Procedure Sync": "ragcoreSync",
+  "Fleet Ops — Workflow Error Handler": "errorHandler",
+};