chore: 并入 iotlcm-openapi 历史到 openapi/（原提交 3b05d5a）

openapi/internal/model/worker_diagnostic.go

@@ -0,0 +1,9 @@
+package model
+
+// WorkerDiagnosticMessage verifies the Admin-to-Worker RabbitMQ path without
+// touching business data.
+type WorkerDiagnosticMessage struct {
+	TraceID string `json:"traceId"`
+	SentAt  int64  `json:"sentAt"`
+	Message string `json:"message"`
+}