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/social/connectors/base.py

@@ -0,0 +1,10 @@
+from typing import Protocol
+
+
+class SocialConnector(Protocol):
+    platform: str
+
+    def publish(self, post, target) -> str:
+        """Publish and return remote post id."""
+
+    def refresh_token(self, account) -> None: ...