Function fetch_pkgbuild_sync 

pub fn fetch_pkgbuild_sync(name: &str) -> Result<String, String>

What: Fetch PKGBUILD content synchronously (blocking).

Inputs:

• name: Package name.

Output:

• Returns PKGBUILD content as a string, or an error if fetch fails.

Errors

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

Panics

• Panics if the rate limiting mutex is poisoned

Details:

• First tries offline methods (yay/paru cache, yay -G, paru -G).
• Then tries AUR with rate limiting (500ms between requests).
• Falls back to official GitLab repos for official packages.
• Uses curl to fetch PKGBUILD from AUR or official GitLab repos.