feat: 添加起卦教程首次访问追踪和Agent时间上下文

- 后端 ProfileSettingsV1 添加 DivinationTutorialSettings 字段
- 前端三个起卦页面添加首次访问检测，自动弹出教程
- 教程展示后更新 settings 标记，避免重复弹出
- 使用本地状态管理避免并发更新覆盖问题
- Agent 系统提示添加时间上下文信息

apps/lib/features/settings/data/apis/profile_api.dart

@@ -51,6 +51,14 @@ class ProfileApi {
           'allow_notifications': settings.notification.allowNotifications,
           'allow_vibration': settings.notification.allowVibration,
         },
+        'divination_tutorial': {
+          'divination_entry_shown':
+              settings.divinationTutorial.divinationEntryShown,
+          'auto_divination_shown':
+              settings.divinationTutorial.autoDivinationShown,
+          'manual_divination_shown':
+              settings.divinationTutorial.manualDivinationShown,
+        },
       },
     };
     final json = await _apiClient.rawDio.patch<Map<String, dynamic>>(
@@ -119,6 +127,23 @@ class ProfileApi {
           )
         : const NotificationSettings();
 
+    final divinationTutorialRaw = settingsRaw is Map<String, dynamic>
+        ? settingsRaw['divination_tutorial']
+        : null;
+    final divinationTutorial = divinationTutorialRaw is Map<String, dynamic>
+        ? DivinationTutorialSettings(
+            divinationEntryShown:
+                (divinationTutorialRaw['divination_entry_shown'] as bool?) ??
+                true,
+            autoDivinationShown:
+                (divinationTutorialRaw['auto_divination_shown'] as bool?) ??
+                true,
+            manualDivinationShown:
+                (divinationTutorialRaw['manual_divination_shown'] as bool?) ??
+                true,
+          )
+        : const DivinationTutorialSettings();
+
     return ProfileSettingsV1(
       displayName: (json['display_name'] as String?) ?? '',
       bio: (json['bio'] as String?) ?? '',
@@ -130,6 +155,7 @@ class ProfileApi {
                 const <String, dynamic>{})
           : const <String, dynamic>{},
       notification: notification,
+      divinationTutorial: divinationTutorial,
     );
   }
 }