Split monolithic script into modular functions and add subcommand interface:
- Add scan subcommand to list FWS installations
- Add repair subcommand with actions: grub, initramfs, pacman, pacman-update, all
- Add shell subcommand for chroot terminal access
- Implement support for operating on running system (no mount/chroot needed)
- Extract detection and mounting logic into reusable functions
- Add in_target() helper to execute commands in target (chroot or direct)
- Improve mkinitcpio warning documentation
- Maintain backward-compatible TUI mode when no args provided
- Enable GUI (fws-recovery-gui) to pilot repairs via subcommands
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