refactor: Improve process termination handling on Windows and update window behavior during shutdown

Author: shenminglinyi

frontend/src-tauri/src/backend.rs

@@ -698,9 +698,13 @@ impl BackendManager {
                 log::info!("🛑 使用 taskkill 强制终止进程树 (PID={})...", pid);
 
                 // /F 强制终止 /T 包含子进程
-                let kill_result = Command::new("taskkill")
-                    .args(["/F", "/T", "/PID", &pid.to_string()])
-                    .output();
+                let mut kill_cmd = Command::new("taskkill");
+                kill_cmd.args(["/F", "/T", "/PID", &pid.to_string()]);
+                #[cfg(target_os = "windows")]
+                {
+                    kill_cmd.creation_flags(windows_subsystem_flag());
+                }
+                let kill_result = kill_cmd.output();
 
                 match kill_result {
                     Ok(output) => {

frontend/src-tauri/src/lib.rs

@@ -49,12 +49,13 @@ pub fn run() {
                 // 已经在关闭中，直接忽略后续点击
                 if GRACEFUL_SHUTDOWN_STARTED.swap(true, Ordering::SeqCst) {
                     api.prevent_close();
+                    let _ = window.hide();
                     return;
                 }
                 api.prevent_close();
 
-                // 最小化窗口给用户反馈（关闭正在进行）
-                let _ = window.minimize();
+                // 立即隐藏窗口，避免关闭时出现最小化/弹回的怪异反馈。
+                let _ = window.hide();
 
                 let app_handle = window.app_handle().clone();
                 std::thread::spawn(move || {