[Developer] #424 style login page and env admin defaults

.env.example

@@ -24,6 +24,8 @@ export BACKOFFICE_DB_PASSWORD="${ADB_PASSWORD}"
 # export ADB_CONN="${ADB_USER}/${ADB_PASSWORD}@${ADB_TNS}"
 
 # --- (2b) Spring Boot 백오피스 ---
+export BACKOFFICE_ADMIN_USER="admin"
+export BACKOFFICE_ADMIN_PASSWORD="admin"
 export BACKOFFICE_ORDS_BASE_URL="https://yh0olybn5pqce4n-d8aukro81636mon0.adb.ap-seoul-1.oraclecloudapps.com/ords"
 export BACKOFFICE_ORDS_TIMEOUT_SECONDS="10"