- Add `install` subcommand with alias `i`
- Support two installation methods: systemd (default) and service
- Copy binary to /usr/local/bin/go-alived
- Auto-detect network interface and hostname for config generation
- Create /etc/go-alived directory and config.yaml
- Install systemd service file with proper capabilities
- Display clear completion message with next steps
- Bump version to 1.2.0
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