Demo Standardization Kit

[vlussenburg]

✨ PR Description

Purpose: Add demo standardization kit to improve cross-service data persistence, UI design, and API documentation across microservices.

Main changes:

• Added order persistence with H2 database in Java service with order history endpoint
• Implemented persistent billing records with file-based storage in C# service
• Enhanced frontend with responsive UI, Swagger documentation, and order history viewing
• Standardized error handling and timestamp formats across services

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frontend/package.json

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frontend/public/app.js

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frontend/public/index.html

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frontend/server.js

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services/auth-python/app/auth.py

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services/billing-csharp/Controllers/BillingController.cs

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services/orders-java/pom.xml

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services/orders-java/src/main/java/com/example/orders/controller/OrderController.java

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services/orders-java/src/test/java/com/example/orders/OrdersApplicationTests.java

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