feat: 完善芽说英语品牌Logo与图标配置，完成跨平台云端同步服务开发与自动化部署

kouyu_english/lib/main.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 
 import 'core/app_state.dart';
 import 'core/app_theme.dart';
+import 'core/sync/sync_coordinator.dart';
 import 'features/onboarding/onboarding_pages.dart';
 import 'features/shell/learning_shell.dart';
 
@@ -23,7 +24,16 @@ class _KouyuEnglishAppState extends State<KouyuEnglishApp> {
   @override
   void initState() {
     super.initState();
-    appState.load();
+    SyncCoordinator.instance.init().then((_) {
+      if (mounted && appState.isLoaded) {
+        SyncCoordinator.instance.triggerBackgroundSync(appState);
+      }
+    });
+    appState.load().then((_) {
+      if (mounted && SyncCoordinator.instance.isInitialized) {
+        SyncCoordinator.instance.triggerBackgroundSync(appState);
+      }
+    });
   }
 
   @override
@@ -35,7 +45,7 @@ class _KouyuEnglishAppState extends State<KouyuEnglishApp> {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: '开口英语',
+      title: '芽说英语 · SpeakSprout',
       debugShowCheckedModeBanner: false,
       theme: buildAppTheme(),
       home: AnimatedBuilder(