Password protect removal of apps on iOS

No need for a jailbreak. Simply go into Settings>General>Restrictions and don't allow "Deleting Apps". Restrictions are protected using a password just like your lock passcode (although it can be a different code if you would like).

If you have the current or a recent version of iOS such as iOS 13 or 12, you can prevent accidental app deletions by disabling all app deletions via Settings -> Screentime-> Content & Privacy Restrictions -> iTunes & App Store Purchases > Deleting Apps > Don't Allow. If you want this option to be password protected, set a password via Settings -> Screentime-> Content&Privacy Restrictions -> Use Screen Time Passcode.