REFACTOR(repo): restructure monitoring folder

- and add namespace resou...
- Remove argocd/, helm-values/, ingress/ subdirectories
- Move files to parent directory (argocd.yaml, helm-values.yaml,
  ingress.yaml)
- Update helm valueFiles paths in ArgoCD Applications
- Add namespace.yaml to all applications with Goldilocks labels
- Update destination namespaces to match folder names
- Update kustomization.yaml files to reference new structure

alertmanager/helm-values.yaml

@@ -0,0 +1,54 @@
+# Alertmanager Helm Values
+# Chart: https://github.com/prometheus-community/helm-charts/tree/main/charts/alertmanager
+
+fullnameOverride: alertmanager
+
+persistence:
+  enabled: true
+  size: 1Gi
+  storageClass: longhorn  # Migrated from local-path to Longhorn (replica=3)
+
+resources:
+  requests:
+    cpu: 10m
+    memory: 32Mi
+
+# Prometheus ServiceMonitor 설정
+serviceMonitor:
+  enabled: true
+  additionalLabels:
+    release: prometheus
+  namespace: monitoring
+
+config:
+  global:
+    resolve_timeout: 5m
+  route:
+    group_by: ["alertname", "cluster", "service"]
+    group_wait: 10s
+    group_interval: 10s
+    repeat_interval: 12h
+    receiver: "default"
+    routes:
+    - match:
+        severity: critical
+      receiver: "critical"
+      continue: true
+    - match:
+        severity: warning
+      receiver: "warning"
+  receivers:
+  - name: "default"
+    # 기본 수신자 (로그만 남김)
+  - name: "critical"
+    # TODO: Slack, Email 등 알림 채널 추가
+    # webhook_configs:
+    # - url: 'http://your-webhook-url'
+  - name: "warning"
+    # TODO: 경고 알림 채널 추가
+  inhibit_rules:
+  - source_match:
+      severity: "critical"
+    target_match:
+      severity: "warning"
+    equal: ["alertname", "cluster", "service"]