fix(shutdown): mark shutdown as exiting to stop background tasks (#5024)

* fix(shutdown): mark shutdown as exiting to stop background tasks

- lib.rs:570 → Flag app as exiting on ExitRequested, notify proxy guard, start cleanup immediately, with fallback in Exit event
- tray/mod.rs:190 → Add unified exit checks around tray init/updates to prevent UI recreation during shutdown
- event_driven_proxy.rs:252 → Ensure proxy guard skips all restore/re-enable work (including sysproxy.exe calls) once exit flag is set

* fix(shutdown): refine exit handling and proxy guard notifications

* fix(shutdown): add guard to run shutdown routine only once per lifecycle

src-tauri/src/core/tray/mod.rs

@@ -188,6 +188,11 @@ singleton_lazy!(Tray, TRAY, Tray::default);
 
 impl Tray {
     pub async fn init(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘初始化");
+            return Ok(());
+        }
+
         let app_handle = handle::Handle::app_handle();
 
         match self.create_tray_from_handle(app_handle).await {
@@ -206,6 +211,11 @@ impl Tray {
 
     /// 更新托盘点击行为
     pub async fn update_click_behavior(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘点击行为更新");
+            return Ok(());
+        }
+
         let app_handle = handle::Handle::app_handle();
         let tray_event = { Config::verge().await.latest_ref().tray_event.clone() };
         let tray_event: String = tray_event.unwrap_or("main_window".into());
@@ -221,6 +231,10 @@ impl Tray {
 
     /// 更新托盘菜单
     pub async fn update_menu(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘菜单更新");
+            return Ok(());
+        }
         // 调整最小更新间隔，确保状态及时刷新
         const MIN_UPDATE_INTERVAL: Duration = Duration::from_millis(100);
 
@@ -309,6 +323,11 @@ impl Tray {
     /// 更新托盘图标
     #[cfg(target_os = "macos")]
     pub async fn update_icon(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘图标更新");
+            return Ok(());
+        }
+
         let app_handle = handle::Handle::app_handle();
 
         let tray = match app_handle.tray_by_id("main") {
@@ -340,6 +359,11 @@ impl Tray {
 
     #[cfg(not(target_os = "macos"))]
     pub async fn update_icon(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘图标更新");
+            return Ok(());
+        }
+
         let app_handle = handle::Handle::app_handle();
 
         let tray = match app_handle.tray_by_id("main") {
@@ -367,6 +391,11 @@ impl Tray {
 
     /// 更新托盘显示状态的函数
     pub async fn update_tray_display(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘显示状态更新");
+            return Ok(());
+        }
+
         let app_handle = handle::Handle::app_handle();
         let _tray = app_handle
             .tray_by_id("main")
@@ -380,6 +409,11 @@ impl Tray {
 
     /// 更新托盘提示
     pub async fn update_tooltip(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘提示更新");
+            return Ok(());
+        }
+
         let app_handle = handle::Handle::app_handle();
 
         let verge = Config::verge().await.latest_ref().clone();
@@ -438,6 +472,10 @@ impl Tray {
     }
 
     pub async fn update_part(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘局部更新");
+            return Ok(());
+        }
         // self.update_menu().await?;
         // 更新轻量模式显示状态
         self.update_tray_display().await?;
@@ -447,6 +485,11 @@ impl Tray {
     }
 
     pub async fn create_tray_from_handle(&self, app_handle: &AppHandle) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘创建");
+            return Ok(());
+        }
+
         log::info!(target: "app", "正在从AppHandle创建系统托盘");
 
         // 获取图标
@@ -524,6 +567,11 @@ impl Tray {
 
     // 托盘统一的状态更新函数
     pub async fn update_all_states(&self) -> Result<()> {
+        if handle::Handle::global().is_exiting() {
+            log::debug!(target: "app", "应用正在退出，跳过托盘状态更新");
+            return Ok(());
+        }
+
         // 确保所有状态更新完成
         self.update_tray_display().await?;
         // self.update_menu().await?;