fix(archsetup): bug fixes, locale support, and code improvements

Bug fixes:
- Initialize errors_encountered at script start (not in intro)
- Capture correct exit code in retry_install loop
- Add missing error_fatal parameters
- Fix unclosed quote in error message
- Quote variables in pacman_install/aur_install commands
- Standardize done statements (remove trailing semicolons)

New features:
- Locale selection prompt with 8 common options + custom entry
- Auto-derive wireless region from locale
- Extract zfs-replicate to separate script file
- Make archsetup repo URL configurable
- Add MulticastDNS=no to avoid avahi conflict

Code improvements:
- Single STEPS array for show_status and main execution loop
- Document security note for config file sourcing
- Add explanatory comment for UFW VM behavior
- Silence update-desktop-database warnings

Config updates:
- Add LOCALE and ARCHSETUP_REPO to example config

Also adds Wayland/Hyprland desktop alternative to V2MOM roadmap.

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