构建初步的设备运行悬浮状态栏，已实现初步的的悬浮和开关功能。

优化了登录链条适配多种用户的登录操作

lib/main.dart

@@ -1,12 +1,16 @@
 import 'dart:async';
-import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'package:flutter/scheduler.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_patcher/flutter_patcher.dart';
 import 'package:go_router/go_router.dart';
+import 'package:get_it/get_it.dart';
+
+// 悬浮条相关
+import 'features/v2/device_list/presentation/float_bar/float_bar_controller.dart';
+import 'features/v2/device_list/presentation/float_bar/simple_float_bar.dart';
+
 import 'package:maibu_satabot_v2/core/app/app_user_cubit.dart';
 import 'package:maibu_satabot_v2/core/infrastructure/logging/app_bloc_observer.dart';
 import 'package:maibu_satabot_v2/core/logging/i_logger_service.dart';
@@ -19,8 +23,13 @@ import 'package:maibu_satabot_v2/features/auth/presentation/bloc/auth_cubit.dart
 import 'package:maibu_satabot_v2/features/devices/presentation/bloc/devices_cubit.dart';
 import 'package:maibu_satabot_v2/features/main_container/presentation/cubit/tab_config_cubit.dart';
 import 'package:maibu_satabot_v2/features/main_container/presentation/main_wrapper.dart';
+// 🔥 导入悬浮条管理器和设置服务
+import 'package:maibu_satabot_v2/features/v2/device_list/presentation/float_bar/manager/float_bar_manager.dart';
+import 'package:maibu_satabot_v2/features/v2/device_list/presentation/float_bar/view/float_bar_widget.dart';
+import 'package:maibu_satabot_v2/features/v2/device_list/presentation/float_bar/cubit/float_bar_setting_cubit.dart';
 
 import 'core/di/injection.dart';
+import 'core/router/route_paths.dart';
 import 'core/localization/app_localizations.dart';
 import 'core/localization/locale_cubit.dart';
 import 'features/auth/presentation/bloc/auth_state.dart';
@@ -28,6 +37,9 @@ import 'features/auth/presentation/bloc/login_cubit.dart';
 import 'features/devices/presentation/bloc/device_status_bloc.dart';
 import 'features/home/presentation/bloc/permission_request_bloc.dart';
 
+// 🔥 全局 GetIt 实例
+final sl = GetIt.instance;
+
 // 🔥 定义全局 Navigator Key
 final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
 
@@ -38,10 +50,17 @@ void main() async {
 
       await FlutterPatcher.init();
       await init();
+
       final logger = sl<ILoggerService>();
       await logger.init();
       Bloc.observer = AppBlocObserver(logger);
 
+      // 🔥 确保 FloatBarSettingService 被初始化，这样 settingNotifier 才不会是 null
+      sl<FloatBarSettingService>();
+      debugPrint(
+        '🔍 [FloatBar] FloatBarSettingService 已初始化，settingNotifier: ${FloatBarSettingService.settingNotifier}',
+      );
+
       // ⚠️ 注意：不要在启动时清除补丁版本记录！
       // 补丁版本记录只在整包更新成功后才清除
       // 如果在启动时清除，会导致差量更新后划掉App再进入时循环更新
@@ -102,7 +121,23 @@ class MyApp extends StatelessWidget {
             theme: AppTheme.lightTheme,
             routerConfig: sl<GoRouter>(),
             builder: (context, child) {
-              return _LifecycleListener(child: _UpdateChecker(child: child!));
+              // 🔥 初始化悬浮条管理器并显示悬浮条
+              debugPrint(
+                '======== [FloatBar] MaterialApp.builder START ========',
+              );
+              debugPrint('🔍 [FloatBar] child: $child');
+              debugPrint(
+                '🔍 [FloatBar] settingNotifier: ${FloatBarSettingService.settingNotifier}',
+              );
+              debugPrint(
+                '🔍 [FloatBar] isEnabled: ${FloatBarSettingService.isEnabled}',
+              );
+              debugPrint(
+                '======== [FloatBar] MaterialApp.builder END ========',
+              );
+              return _FloatBarInitializer(
+                child: _LifecycleListener(child: _UpdateChecker(child: child!)),
+              );
             },
           );
         },
@@ -111,6 +146,35 @@ class MyApp extends StatelessWidget {
   }
 }
 
+/// 悬浮条初始化组件 - 极简版
+class _FloatBarInitializer extends StatelessWidget {
+  final Widget child;
+
+  const _FloatBarInitializer({required this.child});
+
+  @override
+  Widget build(BuildContext context) {
+    return ValueListenableBuilder<bool>(
+      valueListenable: FloatBarController.visibilityNotifier,
+      builder: (context, isVisible, child) {
+        return Stack(
+          children: [
+            child!,
+            if (isVisible)
+              const Positioned(
+                left: 0,
+                right: 0,
+                bottom: 0,
+                child: SimpleFloatBar(),
+              ),
+          ],
+        );
+      },
+      child: child,
+    );
+  }
+}
+
 class _LifecycleListener extends StatefulWidget {
   final Widget? child;
   const _LifecycleListener({required this.child});
@@ -247,6 +311,7 @@ class _UpdateCheckerState extends State<_UpdateChecker> {
                                 child: Column(
                                   crossAxisAlignment: CrossAxisAlignment.start,
                                   children: [
+                                    // 💡 选择下载方式
                                     const Text(
                                       '💡 选择下载方式',
                                       style: TextStyle(