make fullstack hello world compile

packages/fullstack/src/lib.rs

@@ -14,7 +14,8 @@ pub use adapters::*;
 mod hooks;
 #[cfg(all(debug_assertions, feature = "hot-reload", feature = "ssr"))]
 mod hot_reload;
-pub mod launch;
+mod launch;
+pub use launch::*;
 #[cfg(feature = "ssr")]
 mod layer;
 #[cfg(feature = "ssr")]