Function check_faillock_status 

pub fn check_faillock_status(username: &str) -> Result<FaillockStatus, String>

What: Check faillock status for a user.

Inputs:

• username: Username to check faillock status for.

Output:

• Ok(FaillockStatus) with status information, or Err(String) on error.

Errors

• Returns Err if the faillock command cannot be executed.

Details:

• Executes faillock --user <username> command.
• Parses output to count lines with “V” (valid attempts).
• Compares with max attempts from config to determine if locked.
• Returns status with attempt count, max attempts, lock status, and lockout duration.