Demo Standardization Kit

[vlussenburg]

✨ PR Description

Purpose: Standardize and enhance demo application with frontend improvements, API documentation, database persistence, and order history functionality.
Main changes:

• Implemented Swagger UI API documentation with JSDoc annotations for better API discoverability
• Added database persistence for order storage and history retrieval in orders-java service
• Enhanced frontend with styled UI components and improved error handling in authentication flow
• Added order history functionality with new API endpoint and frontend integration

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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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This PR contains a TODO statement. Please check to see if they should be removed.