Function repository_search 

pub async fn repository_search(
    app: AppHandle,
    manager: State<'_, RepositoryManagerWrapper>,
    handle: String,
    query: String,
    options: Option<SearchOptions>,
    request_id: u32,
) -> Result<SearchResult, String>

Search for items.

Resolves SearchOptions::scope into concrete Jellyfin item types before dispatching, so scope taxonomy stays in Rust.

TRACES: UR-049, UR-050 | DR-063