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/features/progress/progress_pages.dart

@@ -7,6 +7,8 @@ import '../../core/app_theme.dart';
 import '../../core/models.dart';
 import '../../core/voice_service.dart';
 import '../../widgets/app_widgets.dart';
+import '../../core/sync/sync_coordinator.dart';
+import 'sync_settings_sheet.dart';
 
 class ProgressPage extends StatelessWidget {
   const ProgressPage({
@@ -93,6 +95,46 @@ class ProgressPage extends StatelessWidget {
               '进入下一阶段条件：60 项固定核心内容中至少 48 项可使用、30 项已掌握，且两套不同题组的听说读写评估都通过并间隔至少 24 小时。',
             ),
           ),
+          AnimatedBuilder(
+            animation: SyncCoordinator.instance,
+            builder: (context, _) {
+              final loggedIn = SyncCoordinator.instance.isLoggedIn;
+              return SectionCard(
+                onTap: () => SyncSettingsSheet.show(context, state),
+                child: Row(
+                  children: [
+                    Icon(
+                      loggedIn
+                          ? Icons.cloud_done_outlined
+                          : Icons.cloud_queue_outlined,
+                      color: loggedIn ? AppColors.green : AppColors.muted,
+                    ),
+                    const SizedBox(width: 10),
+                    Expanded(
+                      child: Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          Text(
+                            loggedIn
+                                ? '云同步：${SyncCoordinator.instance.username}'
+                                : '云端同步与多端备份',
+                            style: const TextStyle(fontWeight: FontWeight.w600),
+                          ),
+                          Text(
+                            loggedIn
+                                ? '多端学习进度与复习状态已连接 · 点击管理'
+                                : '未登录 · 点击配置自建服务器，在手机与电脑间同步',
+                            style: Theme.of(context).textTheme.bodyMedium,
+                          ),
+                        ],
+                      ),
+                    ),
+                    const Icon(Icons.chevron_right, color: AppColors.muted),
+                  ],
+                ),
+              );
+            },
+          ),
           if (state.a0Passed)
             const SectionCard(
               tint: AppColors.softGreen,
@@ -279,6 +321,27 @@ class _SettingsPageState extends State<SettingsPage> {
           onTap: () => _confirmDeleteRecordings(context),
         ),
         const Divider(height: 28),
+        const Text(
+          '云同步与多端备份',
+          style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
+        ),
+        const Text(
+          '支持通过自建服务器在 Android / iOS / macOS 之间同步学习进度与复习掌握度。离线自动缓存，联网自动双向合并。',
+          style: TextStyle(fontSize: 12, color: AppColors.muted),
+        ),
+        AnimatedBuilder(
+          animation: SyncCoordinator.instance,
+          builder: (context, _) => _SettingTile(
+            title: SyncCoordinator.instance.isLoggedIn
+                ? '同步账号：${SyncCoordinator.instance.username}'
+                : '配置云端同步账号',
+            subtitle: SyncCoordinator.instance.isLoggedIn
+                ? '已连接自建服务器 · 点击管理同步'
+                : '未登录 · 点击配置自建服务器并登录',
+            onTap: () => SyncSettingsSheet.show(context, widget.state),
+          ),
+        ),
+        const Divider(height: 28),
         const Text(
           'AI 对话服务',
           style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),