Update tauri ./desktop to mimic axum server create_article index and search API

[AlexMikhalev]

Copy function calls from https://github.com/terraphim/terraphim-ai/blob/main/server-axum/src/api.rs into https://github.com/terraphim/terraphim-ai/blob/main/desktop/src-tauri/src/cmd.rs,