feat: Implement initial schema and add various API, service, and management command enhancements across the application.

backend/apps/lists/admin.py

@@ -14,6 +14,7 @@ from .models import ListItem, UserList
 
 class ListItemInline(admin.TabularInline):
     """Inline admin for ListItem within UserList admin."""
+
     model = ListItem
     extra = 1
     fields = ("content_type", "object_id", "rank", "notes")
@@ -24,6 +25,7 @@ class ListItemInline(admin.TabularInline):
 @admin.register(UserList)
 class UserListAdmin(QueryOptimizationMixin, ExportActionMixin, TimestampFieldsMixin, BaseModelAdmin):
     """Admin interface for UserList."""
+
     list_display = (
         "title",
         "user_link",
@@ -65,6 +67,7 @@ class UserListAdmin(QueryOptimizationMixin, ExportActionMixin, TimestampFieldsMi
     def user_link(self, obj):
         if obj.user:
             from django.urls import reverse
+
             url = reverse("admin:accounts_customuser_change", args=[obj.user.pk])
             return format_html('<a href="{}">{}</a>', url, obj.user.username)
         return "-"
@@ -82,6 +85,7 @@ class UserListAdmin(QueryOptimizationMixin, ExportActionMixin, TimestampFieldsMi
 @admin.register(ListItem)
 class ListItemAdmin(QueryOptimizationMixin, BaseModelAdmin):
     """Admin interface for ListItem."""
+
     list_display = (
         "user_list",
         "content_type",

backend/apps/lists/views.py

@@ -28,4 +28,6 @@ class ListItemViewSet(viewsets.ModelViewSet):
     lookup_field = "id"
 
     def get_queryset(self):
-        return ListItem.objects.filter(user_list__is_public=True) | ListItem.objects.filter(user_list__user=self.request.user)
+        return ListItem.objects.filter(user_list__is_public=True) | ListItem.objects.filter(
+            user_list__user=self.request.user
+        )