Like/dislike + report under every question and lesson, lesson reports and vote columns in admin; practice islands refresh from file; audit fixes

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

content/serializers.py

@@ -1,6 +1,6 @@
 from rest_framework import serializers
 
-from .models import Grade, QuestionReport
+from .models import Grade, LessonReport, QuestionReport
 
 
 # ---- Grades ----
@@ -258,3 +258,8 @@ class QuestionReportResponseSerializer(serializers.Serializer):
     success = serializers.BooleanField()
     reportId = serializers.IntegerField()
     alreadyReported = serializers.BooleanField()
+
+
+class LessonReportRequestSerializer(serializers.Serializer):
+    reason = serializers.ChoiceField(choices=LessonReport.REASON_CHOICES)
+    note = serializers.CharField(required=False, allow_blank=True, max_length=1000)