add option v

src/main.rs

@@ -1066,6 +1066,12 @@ async fn get_log(
 
 #[tokio::main]
 async fn main() {
+    let args: Vec<String> = std::env::args().collect();
+    if args.len() > 1 && (args[1] == "v" || args[1] == "--version" || args[1] == "-v") {
+        println!("{}", env!("CARGO_PKG_VERSION"));
+        return;
+    }
+
     tracing_subscriber::fmt::init();
 
     let db_path = std::env::var("DB_PATH").unwrap_or_else(|_| "chat.db".into());