FIX(prometheus): namespaces in grafana

- and prometheus resources
- Update grafana ExternalSecret namespace: monitoring → grafana
- Update grafana Ingress namespace: monitoring → grafana
- Update prometheus ExternalSecret namespace: monitoring → prometheus
- Aligns with per-app namespace strategy

grafana/ingress.yaml

@@ -2,7 +2,7 @@ apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
   name: grafana-ingress
-  namespace: monitoring
+  namespace: grafana
   annotations:
     nginx.ingress.kubernetes.io/rewrite-target: /
     # HTTP를 HTTPS로 자동 리다이렉트

grafana/vault/grafana-admin-password.yaml

@@ -2,7 +2,7 @@ apiVersion: external-secrets.io/v1beta1
 kind: ExternalSecret
 metadata:
   name: grafana-admin-password
-  namespace: monitoring
+  namespace: grafana
 spec:
   refreshInterval: 1h
   secretStoreRef:

prometheus/vault/postgresql-password.yaml

@@ -2,7 +2,7 @@ apiVersion: external-secrets.io/v1beta1
 kind: ExternalSecret
 metadata:
   name: postgresql-password
-  namespace: monitoring
+  namespace: prometheus
 spec:
   refreshInterval: 1h
   secretStoreRef: