docs: Stage 5/7 완료 정리 및 환경 변수 가이드 갱신

.env.staging.example

@@ -0,0 +1,20 @@
+# Staging 환경 통합 테스트용 설정 예시
+# flutter test integration_test/stock_transaction_state_flow_test.dart \
+#   --dart-define=STAGING_RUN_TRANSACTION_FLOW=true \
+#   --dart-define=STAGING_API_BASE_URL=${STAGING_API_BASE_URL} \
+#   --dart-define=STAGING_API_TOKEN=${STAGING_API_TOKEN} \
+#   --dart-define=STAGING_TRANSACTION_TYPE_ID=${STAGING_TRANSACTION_TYPE_ID} \
+#   --dart-define=STAGING_TRANSACTION_STATUS_ID=${STAGING_TRANSACTION_STATUS_ID} \
+#   --dart-define=STAGING_WAREHOUSE_ID=${STAGING_WAREHOUSE_ID} \
+#   --dart-define=STAGING_EMPLOYEE_ID=${STAGING_EMPLOYEE_ID} \
+#   --dart-define=STAGING_PRODUCT_ID=${STAGING_PRODUCT_ID} \
+#   --dart-define=STAGING_CUSTOMER_ID=${STAGING_CUSTOMER_ID}
+
+STAGING_API_BASE_URL=https://staging-api.example.com
+STAGING_API_TOKEN=replace-with-staging-token
+STAGING_TRANSACTION_TYPE_ID=0
+STAGING_TRANSACTION_STATUS_ID=0
+STAGING_WAREHOUSE_ID=0
+STAGING_EMPLOYEE_ID=0
+STAGING_PRODUCT_ID=0
+STAGING_CUSTOMER_ID=0