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/payments/hooks.py

@@ -0,0 +1,22 @@
+from core.registry import register_dashboard_collector, register_feature, register_portal_nav
+
+
+def register() -> None:
+    register_feature("payments")
+    register_portal_nav(
+        section="payments",
+        label="Invoices",
+        url_name="payments:invoice_list",
+        group="Billing",
+        order=10,
+    )
+    register_dashboard_collector(_dashboard)
+
+
+def _dashboard(request) -> dict:
+    from payments.models import Invoice
+
+    open_count = Invoice.objects.exclude(
+        status__in=[Invoice.Status.PAID, Invoice.Status.VOID]
+    ).count()
+    return {"open_invoices": open_count}