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/blog/hooks.py

@@ -0,0 +1,18 @@
+from core.registry import register_feature, register_portal_nav, register_public_nav
+
+
+def register() -> None:
+    register_feature("blog")
+    register_public_nav(
+        section="blog",
+        label="Blog",
+        url_name="blog:list",
+        order=40,
+    )
+    register_portal_nav(
+        section="blog",
+        label="Blog posts",
+        url_name="blog_portal:portal_list",
+        group="Content",
+        order=10,
+    )