feat(favorites): add EventLike model, favorites API, and notifications module

- EventLike model (user × event unique constraint, indexed)
- contributed_by field on Event (EVT ID or email of community contributor)
- Favorites API endpoints: toggle-like, my-likes, my-liked-events
- Notifications app wired into main urls.py at /api/notifications/
- accounts migration 0014_merge_0013 (resolves split 0013 branches)
- requirements.txt updated

mobile_api/urls.py

@@ -2,6 +2,7 @@ from django.urls import path
 from .views import *
 from mobile_api.views.user import ScheduleCallView
 from mobile_api.views.reviews import ReviewSubmitView, MobileReviewListView, ReviewHelpfulView, ReviewFlagView
+from mobile_api.views.favorites import ToggleLikeView, MyLikedIdsView, MyLikedEventsView
 from ad_control.views import ConsumerFeaturedEventsView, ConsumerTopEventsView
 
 
@@ -39,3 +40,10 @@ urlpatterns += [
     path('reviews/helpful', ReviewHelpfulView.as_view()),
     path('reviews/flag', ReviewFlagView.as_view()),
 ]
+
+# Favorites URLs
+urlpatterns += [
+    path('events/like/', ToggleLikeView.as_view()),
+    path('events/my-likes/', MyLikedIdsView.as_view()),
+    path('events/my-liked-events/', MyLikedEventsView.as_view()),
+]

mobile_api/views/favorites.py

@@ -0,0 +1,146 @@
+from django.views import View
+from django.utils.decorators import method_decorator
+from django.views.decorators.csrf import csrf_exempt
+from django.http import JsonResponse
+from django.core.paginator import Paginator
+
+from events.models import Event, EventLike, EventImages
+from mobile_api.utils import validate_token_and_get_user
+from eventify_logger.services import log
+
+
+def _serialize_liked_event(event):
+    """Serialize an Event for the liked-events list."""
+    primary_img = EventImages.objects.filter(
+        event=event, is_primary=True
+    ).first()
+    if not primary_img:
+        primary_img = EventImages.objects.filter(event=event).first()
+
+    return {
+        'id': event.id,
+        'title': event.title or event.name,
+        'image': primary_img.event_image.url if primary_img else '',
+        'date': str(event.start_date) if event.start_date else None,
+        'location': event.place or '',
+        'venue': event.venue_name or '',
+        'event_type': event.event_type.event_type if event.event_type else '',
+        'event_status': event.event_status,
+    }
+
+
+@method_decorator(csrf_exempt, name='dispatch')
+class ToggleLikeView(View):
+    """POST /api/events/like/ — toggle like on/off for an event."""
+
+    def post(self, request):
+        try:
+            user, token, data, error_response = validate_token_and_get_user(request)
+            if error_response:
+                return error_response
+
+            event_id = data.get('event_id')
+            if not event_id:
+                return JsonResponse(
+                    {'status': 'error', 'message': 'event_id is required'},
+                    status=400
+                )
+
+            try:
+                event = Event.objects.get(pk=event_id)
+            except Event.DoesNotExist:
+                return JsonResponse(
+                    {'status': 'error', 'message': 'Event not found'},
+                    status=404
+                )
+
+            like, created = EventLike.objects.get_or_create(user=user, event=event)
+            if not created:
+                like.delete()
+                return JsonResponse({'status': 'success', 'liked': False})
+
+            return JsonResponse({'status': 'success', 'liked': True})
+
+        except Exception as e:
+            log("error", "ToggleLikeView exception", request=request,
+                logger_data={"error": str(e)})
+            return JsonResponse(
+                {'status': 'error', 'message': 'An unexpected server error occurred.'},
+                status=500
+            )
+
+
+@method_decorator(csrf_exempt, name='dispatch')
+class MyLikedIdsView(View):
+    """POST /api/events/my-likes/ — return all liked event IDs for the user."""
+
+    def post(self, request):
+        try:
+            user, token, data, error_response = validate_token_and_get_user(request)
+            if error_response:
+                return error_response
+
+            liked_ids = list(
+                EventLike.objects.filter(user=user)
+                .values_list('event_id', flat=True)
+            )
+            return JsonResponse({'status': 'success', 'liked_event_ids': liked_ids})
+
+        except Exception as e:
+            log("error", "MyLikedIdsView exception", request=request,
+                logger_data={"error": str(e)})
+            return JsonResponse(
+                {'status': 'error', 'message': 'An unexpected server error occurred.'},
+                status=500
+            )
+
+
+@method_decorator(csrf_exempt, name='dispatch')
+class MyLikedEventsView(View):
+    """POST /api/events/my-liked-events/ — paginated liked events with full data."""
+
+    def post(self, request):
+        try:
+            user, token, data, error_response = validate_token_and_get_user(request)
+            if error_response:
+                return error_response
+
+            page = int(data.get('page', 1))
+            page_size = min(int(data.get('page_size', 20)), 50)
+
+            # Event IDs liked by this user, newest first
+            liked_event_ids = list(
+                EventLike.objects.filter(user=user)
+                .order_by('-created_at')
+                .values_list('event_id', flat=True)
+            )
+
+            # Preserve ordering from liked_event_ids
+            from django.db.models import Case, When, IntegerField
+            ordering = Case(
+                *[When(pk=pk, then=pos) for pos, pk in enumerate(liked_event_ids)],
+                output_field=IntegerField()
+            )
+            events_qs = Event.objects.filter(id__in=liked_event_ids).order_by(ordering)
+
+            paginator = Paginator(events_qs, page_size)
+            page_obj = paginator.get_page(page)
+
+            events_data = [_serialize_liked_event(e) for e in page_obj]
+
+            return JsonResponse({
+                'status': 'success',
+                'events': events_data,
+                'total': paginator.count,
+                'page': page,
+                'page_size': page_size,
+                'has_next': page_obj.has_next(),
+            })
+
+        except Exception as e:
+            log("error", "MyLikedEventsView exception", request=request,
+                logger_data={"error": str(e)})
+            return JsonResponse(
+                {'status': 'error', 'message': 'An unexpected server error occurred.'},
+                status=500
+            )