fix(cli): show help instead of TUI when no subcommand given

src/main.rs

@@ -26,7 +26,8 @@ fn main() {
             println!("{}", env!("CARGO_PKG_VERSION"));
         }
         Some("help" | "--help" | "-h") => print_help(),
-        None | Some("tui") => {
+        None => print_help(),
+        Some("tui") => {
             // Show logo before entering alternate screen
             eprintln!("\x1b[38;5;226m{}\x1b[0m\n\x1b[1m  aishell\x1b[0m v{}\n",
                 LOGO, env!("CARGO_PKG_VERSION"));