feat: implement tray in linux

flutter/lib/desktop/pages/desktop_home_page.dart

@@ -432,7 +432,8 @@ class _DesktopHomePageState extends State<DesktopHomePage>
       updateUrl = await bind.mainGetSoftwareUpdateUrl();
       if (updateUrl.isNotEmpty) setState(() {});
     });
-    initTray();
+    // disable this tray because we use tray function provided by rust now
+    // initTray();
     trayManager.addListener(this);
     windowManager.addListener(this);
     rustDeskWinManager.setMethodHandler((call, fromWindowId) async {

flutter/lib/models/native_model.dart

@@ -90,10 +90,6 @@ class PlatformFFI {
   /// Init the FFI class, loads the native Rust core library.
   Future<void> init(String appType) async {
     _appType = appType;
-    // if (isDesktop) {
-    //   // TODO
-    //   return;
-    // }
     final dylib = Platform.isAndroid
         ? DynamicLibrary.open('librustdesk.so')
         : Platform.isLinux