Function fetch_pkgbuild_fast 

pub async fn fetch_pkgbuild_fast(
    item: &PackageItem,
) -> Result<String, Box<dyn Error + Send + Sync>>

What: Fetch PKGBUILD content for a package from AUR or official Git packaging repos.

Inputs:

• item: Package whose PKGBUILD should be retrieved.

Output:

• Ok(String) with PKGBUILD text when available; Err on network or lookup failure.

Errors

• Returns Err when network request fails (curl execution error)
• Returns Err when PKGBUILD cannot be fetched from AUR or official GitLab repositories
• Returns Err when rate limiting mutex is poisoned
• Returns Err when task spawn fails

Panics

• Panics if the rate limiting mutex is poisoned

Details:

• First tries offline methods (yay/paru cache) for fast loading.
• Then tries network with rate limiting and timeout (10s).
• Uses curl with timeout to prevent hanging on slow servers.