백킹서비스 및 개발 관련 디렉토리 추가

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

backing-service/install/redis/redis-external.yaml

@@ -0,0 +1,20 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis-external
+spec:
+  ports:
+  - name: tcp-redis
+    port: 6379
+    protocol: TCP
+    targetPort: redis
+  - name: tcp-sentinel
+    port: 26379
+    protocol: TCP
+    targetPort: redis-sentinel
+  publishNotReadyAddresses: true
+  selector:
+    app.kubernetes.io/instance: redis
+    app.kubernetes.io/name: redis
+  sessionAffinity: None
+  type: LoadBalancer