FEAT(k8s): add k8s monitoring dashboard

- Add monitoring page with Grafana-style UI and real-time charts
- Implement Prometheus metrics API endpoint with comprehensive queries
- Add Chart.js for visualizing cluster metrics
- Include Overview, Resources, Kubernetes, and Network sections
- Support both production (Prometheus) and development (mock) data
- Add PROMETHEUS_URL environment variable to deployment

deploy/k8s/base/deployment.yaml

@@ -43,6 +43,8 @@ spec:
                   name: argocd-ca-cert
                   key: ca.crt
                   optional: true
+            - name: PROMETHEUS_URL
+              value: "http://prometheus.monitoring.svc.cluster.local:9090"
           resources:
             requests:
               memory: "100Mi"

deploy/k8s/overlays/prod/kustomization.yaml

@@ -13,7 +13,7 @@ commonLabels:
 # 이미지 태그 설정
 images:
   - name: ghcr.io/mayne0213/portfolio
-    newTag: main-sha-0981be0a1847a9bce2595c0eb42bb616e0c4ae30
+    newTag: main-sha-a9ded587c52ffcd723797ef76cfbfde8c3641e0c
 
 patchesStrategicMerge:
   - deployment-patch.yaml