عرض عملي: ShopProperties مُنمّطة ومتحقَّق منها وتفشل مبكرًا

خطوة بخطوة

1. Create the ShopProperties record and enable scanning.
2. Add shop.currency, shop.tax-rate, shop.page-size-max to application.yml; inject the record into a service.
3. Add dev and prod profile files with different values.
4. Planned mistake: set tax-rate: 1.5; the app refuses to start. Read the message ("Binding to target ... failed") and the property name; fix the value.
5. Override the value with an environment variable and show it winning.