FIX(repo): set ha.config to empty to avoid duplicate listener

- Set HA config to empty
- Prevent duplicate listener issue

vault/helm-values.yaml

@@ -22,6 +22,8 @@ server:
     replicas: 3
     raft:
       enabled: false
+    # Empty config - actual config is in vault-config-secret
+    config: ""
 
   # PVC 비활성화 (PostgreSQL 사용)
   dataStorage: