fix web and multi platform adaptation

lib/pages/home_page.dart

@@ -20,12 +20,20 @@ class HomePage extends StatefulWidget {
 
 class _HomePageState extends State<HomePage> {
   var _selectedIndex = 0;
-  final List<PageShape> _pages = [
-    ConnectionPage(),
-    chatPage,
-    ServerPage(),
-    SettingsPage()
-  ];
+  final List<PageShape> _pages = [];
+
+  @override
+  void initState() {
+    super.initState();
+    _pages.addAll([
+      ConnectionPage(),
+      chatPage,
+    ]);
+    if(isAndroid){
+      _pages.add(ServerPage());
+    }
+    _pages.add(SettingsPage());
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -58,7 +66,7 @@ class _HomePageState extends State<HomePage> {
             unselectedItemColor: MyTheme.darkGray,
             onTap: (index) => setState(() {
               // close chat overlay when go chat page
-              if(index == 1 && _selectedIndex!=index){
+              if (index == 1 && _selectedIndex != index) {
                 hideChatIconOverlay();
                 hideChatWindowOverlay();
               }
@@ -69,3 +77,20 @@ class _HomePageState extends State<HomePage> {
         ));
   }
 }
+
+class WebHomePage extends StatelessWidget {
+  final connectionPage = ConnectionPage();
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: MyTheme.grayBg,
+      appBar: AppBar(
+        centerTitle: true,
+        title: Text("RustDesk"),
+        actions: connectionPage.appBarActions,
+      ),
+      body: connectionPage,
+    );
+  }
+}

lib/pages/server_page.dart

@@ -3,7 +3,6 @@ import 'package:flutter_hbb/models/model.dart';
 import 'package:provider/provider.dart';
 
 import '../common.dart';
-import '../models/native_model.dart';
 import '../models/server_model.dart';
 import 'home_page.dart';
 import '../models/model.dart';
@@ -156,7 +155,6 @@ class _PermissionCheckerState extends State<PermissionChecker> {
   @override
   Widget build(BuildContext context) {
     final serverModel = Provider.of<ServerModel>(context);
-    final androidVersion = PlatformFFI.androidVersion ?? 0;
     final hasAudioPermission = androidVersion>=30;
     return PaddingCard(
         title: translate("Configuration Permissions"),