[Feature] Add advertisement click functionality to ads-java service

[eddie-rowe]

This pull request introduces changes to the ad management system, including backend enhancements for handling ad clicks, frontend updates for improved ad display and interactivity, and the addition of ad pages for "Cool Hats", "Discount Clothing", and "Nice Bags". Below is a summary of the most important changes:

Backend Enhancements for Ad Management:

• Added a new clickUrl field to the Advertisement entity and updated the Advertisement class to include a new constructor and getter/setter methods for this field. This allows ads to have specific URLs for redirection. [1] [2]
• Implemented a new /click/{id} endpoint in the AdsJavaApplication class to handle ad clicks. This endpoint logs the click, retrieves the ad by its ID, and redirects the user to the associated clickUrl or a default URL if none is set.
• Enhanced the database initialization logic to include meaningful clickUrl values for ads and ensure existing ads are updated with the correct URLs.

Frontend Updates for Ad Interactivity:

• Updated the Ad component in Ad.tsx to include a handleAdClick function that redirects users to the backend click endpoint when an ad is clicked. The ad banner now includes a cursor-pointer style and a title attribute for better user experience. [1] [2]
• Refactored the Ad component to use a proper TypeScript interface (Advertisement) for better type safety and clarity.
• Added pages for "Cool Hats", "Discount Clothing", and "Nice Bags".

How to test

1. Checkout this branch.
2. Run docker compose -f docker-compose.dev.yml up -d
3. Navigate to http://localhost and click on the ads to ensure all three ads work as expected

[arosenkranz]

Just a few small style tweaks, good stuff.