fix: use stable ai sdk dep

[markacianfrani]

should resolve #19 but I'm not entirely sure what the intent of using the beta SDK was. also that issue could just be a skill issue on my end.

[Copilot]

Pull Request Overview

This PR resolves dependency issues by migrating from beta versions to stable releases of AI SDK packages. The change addresses issue #19 in the repository where beta dependencies may have been causing compatibility or stability problems.

• Updated AI SDK dependencies from "beta" to specific stable versions
• Added ai package as a production dependency and moved dotenv to devDependencies for better organization
• Updated example project to use stable ai package version

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Updated AI SDK dependencies to stable versions and reorganized dependency classifications
examples/ai/package.json	Updated ai dependency from beta to stable version

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}