Hub01 Shop Integration

Hey!

So, as I promised, I went ahead and built a **Rust implementation of the Hub01 Shop API Client** to make integrating with CatLauncher super easy. You can check it out here:

- **GitHub Repo:** [SrGnis/Hub01-Shop-API-libs](https://github.com/SrGnis/Hub01-Shop-API-libs)
- **Crates.io:** [hub01-client](https://crates.io/crates/hub01-client)

I also threw together a **POC TUI** to test everything out, it’s in the `rust-poc` branch if you wanna have a usage example take a look here:
[rust-poc branch](https://github.com/SrGnis/Hub01-Shop-API-libs/tree/rust-poc/rust_poc)

If you’ve got any questions jus tell me! 😊

Review the provided Rust client library at SrGnis/Hub01-Shop-API-libs and its rust-poc branch for a usage example. Determine how to integrate this client into the CatLauncher Tauri backend. The work involves understanding the existing launcher architecture, the Hub01 Shop API, and designing the integration points. 'Done' means the launcher can communicate with the Hub01 Shop using the new Rust client.

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