feat: safety checks + backup + uninstall for secondary-setup.sh
Pre-flight checks before installation:
- Detect existing WireGuard, Phobos clients, tokens, server.env
- Check port conflicts (obfuscator ports, 51820, 8444)
- Check running conflicting services
- Pause with warning count if issues found
Safety during install:
- Auto-backup existing configs to /opt/Phobos/backup/TIMESTAMP/
- Preserve existing wg0.conf if found (reuse keys)
- Skip obfuscator binary download if already installed
Clean uninstall script:
- /opt/Phobos/server/phobos-secondary-uninstall.sh
- Stops all services, removes configs and systemd units
- Preserves backup directory
- Removes iptables rules
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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