/api/user/summary: streak.activeToday and streak.lost for the app's lit / at-risk / frozen flame

activeToday: activity recorded today (Tehran date). lost: length of a streak that broke (last active day
before yesterday), so the app can show it frozen. Same rule as effective_current_streak; the weekly report
keeps its own two-field streak serializer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

progress/serializers.py

@@ -6,6 +6,14 @@ class StreakSummarySerializer(serializers.Serializer):
     longest = serializers.IntegerField()
 
 
+class UserStreakSerializer(StreakSummarySerializer):
+    """زنجیره در /api/user/summary: به‌علاوه‌ی وضعیتی که خانه با آن آتش/در خطر/یخ‌زده را نشان می‌دهد."""
+    activeToday = serializers.BooleanField(help_text='امروز (وقتِ تهران) فعالیتی ثبت شده؛ زنجیره امروز روشن است.')
+    lost = serializers.IntegerField(
+        help_text='طولِ زنجیره‌ای که با نیامدنِ دیروز شکست؛ صفر یعنی چیزی نشکسته. اپ آن را «یخ‌زده» نشان می‌دهد.',
+    )
+
+
 class UserSummaryResponseSerializer(serializers.Serializer):
     userId = serializers.CharField()
     name = serializers.CharField()
@@ -13,7 +21,7 @@ class UserSummaryResponseSerializer(serializers.Serializer):
     gradeId = serializers.IntegerField(allow_null=True)
     xp = serializers.IntegerField()
     coins = serializers.IntegerField()
-    streak = StreakSummarySerializer()
+    streak = UserStreakSerializer()
     subscription = serializers.CharField(allow_null=True)