Meai conversion

[alexwolfmsft]

Summary

This PR addresses the following changes:

• Migrates the first quickstart to MEAI
• Updates the URLs for the other quickstarts to work with the restructured .NET AI Samples repo
• Begins to move code samples to compiled projects

Fixes #Issue_Number (if available)

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Internal previews

📄 File	🔗 Preview link
docs/ai/quickstarts/get-started-openai.md	CustomerIntent: As a .NET developer new to AI, I want deploy and use sample code to interact to learn from the sample code.
docs/ai/quickstarts/quickstart-ai-chat-with-data.md	Get insight about your data from a .NET AI chat app
docs/ai/quickstarts/quickstart-azure-openai-tool.md	[Azure Developer CLI](https://review.learn.microsoft.com/en-us/dotnet/ai/quickstarts/quickstart-azure-openai-tool?branch=pr-en-us-43405)
docs/ai/quickstarts/quickstart-openai-generate-images.md	[Azure Portal](https://review.learn.microsoft.com/en-us/dotnet/ai/quickstarts/quickstart-openai-generate-images?branch=pr-en-us-43405)
docs/ai/quickstarts/quickstart-openai-summarize-text.md	Quickstart - Summarize text using an AI chat app with .NET
docs/ai/quickstarts/snippets/prompt-completion/azure-openai/benefits.md	Hiking Benefits
docs/ai/quickstarts/snippets/prompt-completion/openai/benefits.md	docs/ai/quickstarts/snippets/prompt-completion/openai/benefits
docs/ai/toc.yml	docs/ai/toc