feat: Introduce lists and reviews apps, refactor user list functionality from accounts, and add user profile fields.

backend/apps/lists/admin.py

@@ -0,0 +1,90 @@
+from django.contrib import admin
+from django.db.models import Count
+from django.utils.html import format_html
+from apps.core.admin import (
+    BaseModelAdmin,
+    ExportActionMixin,
+    QueryOptimizationMixin,
+    TimestampFieldsMixin,
+)
+from .models import UserList, ListItem
+
+
+class ListItemInline(admin.TabularInline):
+    """Inline admin for ListItem within UserList admin."""
+    model = ListItem
+    extra = 1
+    fields = ("content_type", "object_id", "rank", "notes")
+    ordering = ("rank",)
+    show_change_link = True
+
+
+@admin.register(UserList)
+class UserListAdmin(QueryOptimizationMixin, ExportActionMixin, TimestampFieldsMixin, BaseModelAdmin):
+    """Admin interface for UserList."""
+    list_display = (
+        "title",
+        "user_link",
+        "category",
+        "is_public",
+        "item_count",
+        "created_at",
+        "updated_at",
+    )
+    list_filter = ("category", "is_public", "created_at", "updated_at")
+    list_select_related = ["user"]
+    list_prefetch_related = ["items"]
+    search_fields = ("title", "user__username", "description")
+    autocomplete_fields = ["user"]
+    inlines = [ListItemInline]
+
+    export_fields = ["id", "title", "user", "category", "is_public", "created_at", "updated_at"]
+    export_filename_prefix = "user_lists"
+
+    fieldsets = (
+        (
+            "Basic Information",
+            {
+                "fields": ("user", "title", "category", "description", "is_public"),
+                "description": "List identification and categorization.",
+            },
+        ),
+        (
+            "Timestamps",
+            {
+                "fields": ("created_at", "updated_at"),
+                "classes": ("collapse",),
+            },
+        ),
+    )
+    readonly_fields = ("created_at", "updated_at")
+
+    @admin.display(description="User")
+    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 "-"
+
+    @admin.display(description="Items")
+    def item_count(self, obj):
+        return obj.items.count()
+
+    def get_queryset(self, request):
+        qs = super().get_queryset(request)
+        qs = qs.annotate(_item_count=Count("items", distinct=True))
+        return qs
+
+
+@admin.register(ListItem)
+class ListItemAdmin(QueryOptimizationMixin, BaseModelAdmin):
+    """Admin interface for ListItem."""
+    list_display = (
+        "user_list",
+        "content_type",
+        "object_id",
+        "rank",
+    )
+    list_filter = ("user_list__category", "content_type", "rank")
+    list_select_related = ["user_list", "user_list__user", "content_type"]