describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Add order history feature with data persistence to microservices demo application while improving frontend UI.
Main changes:

• Added database persistence for orders in Java service with SQL storage and retrieval
• Implemented order history endpoint and UI functionality to display past orders
• Enhanced frontend with improved styling, form validation, and Swagger API documentation
• Added charge record persistence in C# billing service

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