Populate the client website template with catalog feature flags.

Extract always-on public/portal/UTM plus optional email_sms, directmail, blog, payments, social, and social_ai so new client sites can be bootstrapped from this seed.

Refs #1
Refs #2

Co-authored-by: Cursor <cursoragent@cursor.com>

site/core/admin.py

@@ -0,0 +1,10 @@
+from django.contrib import admin
+
+from core.models import StoredFile
+
+
+@admin.register(StoredFile)
+class StoredFileAdmin(admin.ModelAdmin):
+    list_display = ("filename", "kind", "content_type", "size", "created_at")
+    list_filter = ("kind", "content_type")
+    readonly_fields = ("size", "content_type", "created_at", "updated_at")