Fix embed-ui feature: correct rust-embed folder path

- Changed rust-embed folder from '../ui' to 'ui' (relative to crate root)
- Added conditional imports to eliminate unused import warnings
- Now UI files properly embed into botui binary during compilation
- Resolves production error: 'Asset suite/index.html not found in embedded binary'

src/ui_server/mod.rs

@@ -20,11 +20,12 @@ use tokio_tungstenite::{
     connect_async_tls_with_config, tungstenite,
     tungstenite::protocol::Message as TungsteniteMessage,
 };
+#[cfg(not(feature = "embed-ui"))]
 use tower_http::services::{ServeDir, ServeFile};
 
 #[cfg(feature = "embed-ui")]
 #[derive(RustEmbed)]
-#[folder = "../ui"]
+#[folder = "ui"]
 struct Assets;
 
 use crate::shared::AppState;