Put the sp1 worker code behind the sp1 feature in the host

Author: Champii

host/src/server/mod.rs

@@ -5,10 +5,12 @@ use tokio::net::TcpListener;
 use tracing::info;
 
 pub mod api;
+#[cfg(feature = "sp1")]
 pub mod worker;
 
 /// Starts the proverd server.
 pub async fn serve(state: ProverState) -> anyhow::Result<()> {
+    #[cfg(feature = "sp1")]
     worker::serve(state.clone()).await;
 
     let addr = SocketAddr::from_str(&state.opts.address)