عرض عملي: من println إلى سجلات JSON مهيكلة

خطوة بخطوة

1. Show Shop CLI with System.out.println debugging.
2. Add SLF4J and Logback dependencies in the POM (verify versions before recording).
3. Replace println with log.info and placeholders.
4. Planned mistake: log the card number in clear text, then spot it in the output. Fix: mask it with a helper and add a test.
5. Switch the output to JSON through Logback configuration (a JSON encoder; verify the library).
6. Trigger an error and show one stack trace, not two.

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