feat: init ai app

[bigint]

What does this PR do?

🤖 Generated by Copilot at 6776982

This pull request adds a new AI service to the packages/ai directory, which uses HuggingFace models to perform topic tagging on texts. The service consists of a Flask app, a Dockerfile, a model downloader, and a README file. The pull request also updates the .gitignore file to ignore the models/ directory.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 6776982

• Build and run a Docker image for the AI application that uses a GPU-supported CUDA runtime and exposes port 8000 (link)
• Download and save the models from HuggingFace to the models/ directory, which is ignored by git (link, link)
• Implement a Flask app that initializes the model, provides a health check, and predicts topics and scores for a given text using the tagger endpoint (link)
• Document the AI service functionality, models, endpoints, and setup instructions in the README.md file (link)
• Specify the Python dependencies for the AI application in the requirements.txt file (link)

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