jorexdeveloper/termux-arch ? reverse-engineered prompt

Build me a simple Termux based installer that lets me set up Arch Linux on Android without root.

I want one easy script I can run in Termux that downloads everything, installs a minimal Arch system, and gives me a command to start it later, like archlinux or a short alias. It should also support a few helpful options, like showing help, choosing a username, and handling install, launch, backup, restore, rename, and uninstall in a clean way.

After installation, I want clear steps for opening the Arch shell, updating it, and setting up a desktop through VNC so I can use a graphical interface on my phone. Please keep the experience beginner friendly, with simple instructions and sensible defaults. If anything needs checking against current docs online, go ahead and look it up.