Update harbor.md

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For Issue

Closes big-bang/product/packages/harbor#104 (closed)

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docs/understanding-bigbang/package-architecture/harbor.md

+### Harbor
+
+```mermaid
+graph LR
+  subgraph "Harbor"
+    harborpods("Harbor Pods")
+  end
+
+  subgraph "Ingress"
+    ig(Ingress Gateway) --> harborpods("Harbor Pods")
+  end
+
+  subgraph "External Databases"
+    harborpods("Harbor Pods") --> database1[(PostgreSQL DB)]
+    harborpods("Harbor Pods") --> database2[(Redis DB)]
+  end
+
+  subgraph "Object Storage (S3/Swift)"
+    harborpods("Harbor Pods") --> bucket[(Harbor Bucket)]
+  end
+
+  subgraph "Image Scanner"
+    harborpods("Harbor Pods") --> Trivy("Trivy")
+  end
+
+  subgraph "Logging"
+    harborpods("Harbor Pods") --> fluent(Fluentbit) --> logging-ek-es-http
+    logging-ek-es-http{{Elastic Service<br />logging-ek-es-http}} --> elastic[(Elastic Storage)]
+  end
+
+  subgraph "Monitoring"
+    svcmonitor("Service Monitor") --> harborpods("Harbor Pods")
+    Prometheus --> svcmonitor("Service Monitor")
+  end
+