bill-inquiry DB storageClass 변경

- storageClass를 'standard'에서 'managed'로 변경
- 운영 환경 호환성 향상

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

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

develop/database/exec/bill-inquiry-postgres-values.yaml

@@ -7,7 +7,7 @@ global:
       database: "bill_inquiry_db"
       username: "bill_inquiry_user"
       password: "BillUser2025@"
-  storageClass: "standard"
+  storageClass: "managed"
 
 # Primary 설정 (개발환경 단독 구성)
 architecture: standalone
@@ -25,7 +25,7 @@ primary:
   # 스토리지 설정
   persistence:
     enabled: true
-    storageClass: "standard"
+    storageClass: "managed"
     size: 20Gi
 
   # PostgreSQL 성능 설정 (개발환경 최적화)