쿠버네티스 배포 설정 업데이트

- 데이터베이스 연결 정보 업데이트 (LoadBalancer External IP 적용)
- Redis 캐시 설정 최적화
- API Gateway CORS 설정 개선
- 백엔드 서비스 보안 설정 강화
- 데이터베이스 테스트 연결 스크립트 추가

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

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

deployment/k8s/common/cm-common.yaml

@@ -3,7 +3,7 @@ kind: ConfigMap
 metadata:
   name: cm-common
 data:
-  CORS_ALLOWED_ORIGINS: "http://localhost:8081,http://localhost:8082,http://localhost:8083,http://localhost:8084,http://phonebill.20.214.196.128.nip.io"
+  CORS_ALLOWED_ORIGINS: "http://localhost:8081,http://localhost:8082,http://localhost:8083,http://localhost:8084,http://phonebill-dg0500.20.214.196.128.nip.io"
   JWT_ACCESS_TOKEN_VALIDITY: "18000000"
   JWT_REFRESH_TOKEN_VALIDITY: "86400000"
   REDIS_PORT: "6379"

deployment/k8s/common/ingress.yaml

@@ -8,7 +8,7 @@ metadata:
 spec:
   ingressClassName: nginx
   rules:
-  - host: phonebill-api.20.214.196.128.nip.io
+  - host: phonebill-dg0500-api.20.214.196.128.nip.io
     http:
       paths:
       - path: /api/v1/auth

deployment/k8s/common/secret-common.yaml

@@ -6,4 +6,4 @@ type: Opaque
 stringData:
   JWT_SECRET: "nwe5Yo9qaJ6FBD/Thl2/j6/SFAfNwUorAY1ZcWO2KI7uA4bmVLOCPxE9hYuUpRCOkgV2UF2DdHXtqHi3+BU/ecbz2zpHyf/720h48UbA3XOMYOX1sdM+dQ=="
   REDIS_HOST: "redis-cache-dev-master"
-  REDIS_PASSWORD: "Redis2025Dev!"
+  REDIS_PASSWORD: "Redis2025Dev@"