Function fetch_srcinfo 

pub fn fetch_srcinfo(
    name: &str,
    timeout_seconds: Option<u64>,
) -> Result<String, String>

What: Fetch .SRCINFO content for an AUR package synchronously using curl.

Inputs:

• name: AUR package name.
• timeout_seconds: Optional timeout in seconds (None = no timeout).

Output:

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

Errors

• Returns Err when network request fails (curl execution error)
• Returns Err when .SRCINFO cannot be fetched from AUR
• Returns Err when response is empty or contains HTML error page
• Returns Err when response does not appear to be valid .SRCINFO format

Details:

• Downloads .SRCINFO from AUR cgit repository.
• Validates that the response is not empty, not HTML, and contains .SRCINFO format markers.