Function collect_network_endpoint_env_vars 

pub fn collect_network_endpoint_env_vars(
    network_endpoints: &[NetworkEndpointInfo],
) -> Vec<DeploymentSecretInput>

Interactive prompt to offer network connection details as env vars.

Shows discovered network info and lets the user select which to inject. Returns DeploymentSecretInput entries with is_secret: false (network identifiers are infrastructure metadata, not secrets).