feat: add user search/filter, banned metric, mobile review API, event detail improvements

- admin_api/views.py: Add banned count to UserMetrics, fix server-side search/filter in UserListView
- admin_api/models.py: Add ReviewInteraction model, display_name/is_verified/helpful_count/flag_count to Review
- mobile_api/views/reviews.py: Customer-facing review submit/list/helpful/flag endpoints
- mobile_api/urls.py: Wire review API routes
- mobile_api/views/events.py: Event detail and listing improvements
- Security hardening across API modules

events/api.py

@@ -45,7 +45,7 @@ def _event_to_dict(event, request=None):
     }
     if event.event_type.event_type_icon:
         if request:
-            data["event_type"]["event_type_icon"] = request.build_absolute_uri(event.event_type.event_type_icon.url)
+            data["event_type"]["event_type_icon"] = event.event_type.event_type_icon.url
         else:
             data["event_type"]["event_type_icon"] = event.event_type.event_type_icon.url
     else: