백킹서비스 및 개발 관련 디렉토리 추가

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backing-service/install/postgres/content-external.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: content-postgresql-external
+spec:
+  ports:
+  - name: tcp-postgresql
+    port: 5432
+    protocol: TCP
+    targetPort: tcp-postgresql
+  selector:
+    app.kubernetes.io/component: primary
+    app.kubernetes.io/instance: content
+    app.kubernetes.io/name: postgresql
+  sessionAffinity: None
+  type: LoadBalancer