feat: add is_featured/is_top_event fields and API endpoints

- Event model: added is_featured, is_top_event BooleanFields
- Migration 0007 applied to DB
- EventForm: checkboxes for both new fields
- EventAdmin: list_display, list_editable, list_filter for both flags
- FeaturedEventsAPI: POST /api/events/featured-events/ -> is_featured=True events
- TopEventsAPI: POST /api/events/top-events/ -> is_top_event=True events

events/migrations/0007_add_is_featured_is_top_event.py

@@ -0,0 +1,21 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0006_alter_event_source'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='event',
+            name='is_featured',
+            field=models.BooleanField(default=False, help_text='Show this event in the featured section'),
+        ),
+        migrations.AddField(
+            model_name='event',
+            name='is_top_event',
+            field=models.BooleanField(default=False, help_text='Show this event in the Top Events section'),
+        ),
+    ]