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

mobile_api/urls.py

@@ -1,5 +1,6 @@
 from django.urls import path
 from .views import *
+from mobile_api.views.reviews import ReviewSubmitView, MobileReviewListView, ReviewHelpfulView, ReviewFlagView
 
 
 # Customer URLS
@@ -24,3 +25,11 @@ urlpatterns += [
     path('events/featured-events/', FeaturedEventsAPI.as_view(), name='featured_events'),
     path('events/top-events/', TopEventsAPI.as_view(), name='top_events'),
 ]
+
+# Review URLs
+urlpatterns += [
+    path('reviews/submit', ReviewSubmitView.as_view()),
+    path('reviews/list', MobileReviewListView.as_view()),
+    path('reviews/helpful', ReviewHelpfulView.as_view()),
+    path('reviews/flag', ReviewFlagView.as_view()),
+]