Function resolve_target_host 

pub fn resolve_target_host(
    remote_host: Option<&str>,
    force_local: bool,
) -> Option<String>

Resolve the target host name based on flags and hosts.json

Resolution order:

1. –local (force local Docker)
2. –remote-host flag (explicit)
3. default_host from hosts.json
4. Local Docker (no host_name)