feat(auditlog): per-script-execution correlation id on sync audit rows

src/ScadaLink.InboundAPI/Middleware/AuditWriteMiddleware.cs

@@ -145,6 +145,10 @@ public sealed class AuditWriteMiddleware
                 OccurredAtUtc = DateTime.UtcNow,
                 Channel = AuditChannel.ApiInbound,
                 Kind = kind,
+                // Audit Log #23: a fresh per-request correlation id so the
+                // inbound row carries a request identifier (closes the design
+                // gap that inbound rows should be correlatable).
+                CorrelationId = Guid.NewGuid(),
                 Actor = actor,
                 Target = methodName,
                 Status = status,