عرض عملي: ملف JAR واحد وثلاث بيئات

خطوة بخطوة

1. Build shop-cli.jar once.
2. Run with the default file: currency EUR, tax 19%.
3. Run with SHOP_TAX_RATE=0.07; the output changes.
4. Planned mistake: commit a .env with a real key; spot it in git status. Fix: remove it from the index, add it to .gitignore, rotate the key, and commit .env.example.
5. Run a third time with -Dshop.currency=USD.
6. Show the precedence order in the README.

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