Implement a robust desktop installation retry system that handles transient network issues during the Arch installation process.
Changes:
- Create fws-desktop-retry script in /usr/local/bin for manual recovery after installation
- Add DNS resolution wait loop (up to 10 attempts with 3-second intervals)
- Implement pacman retry logic with up to 3 attempts (15-second delay between retries)
- Generate /var/lib/fws/desktop-failed marker file on installation failure
- Create informative MOTD message guiding users to retry desktop installation
- Preserve FWS-specific MOTD when it contains retry instructions
This allows users to recover from network/mirror failures without reinstalling the entire system.
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