refs #731: enrich Text2SQL prompts with QA examples

.env.example

@@ -57,6 +57,8 @@ export BACKOFFICE_SELECT_AI_DB_URL="${BACKOFFICE_DB_URL}"
 export BACKOFFICE_SELECT_AI_DB_USERNAME=""
 export BACKOFFICE_SELECT_AI_DB_PASSWORD=""
 export BACKOFFICE_SELECT_AI_PROFILE=""
+export BACKOFFICE_SELECT_AI_FEW_SHOT_ENABLED="true"
+export BACKOFFICE_SELECT_AI_FEW_SHOT_TOP_K="3"
 
 # 공통 데이터 카탈로그. objects는 key/tableName/objectType/businessName/description JSON 배열입니다.
 # 배포 환경마다 반드시 실제 소유자와 허용 객체를 지정합니다.