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/directmail/providers/postcard/__init__.py

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+"""Pluggable postcard providers."""
+
+from dataclasses import dataclass
+from typing import Protocol
+
+from django.conf import settings
+
+
+@dataclass
+class PostcardResult:
+    provider_id: str
+
+
+class PostcardProvider(Protocol):
+    name: str
+
+    def send_postcard(self, message) -> PostcardResult: ...
+
+    def get_status(self, provider_id: str) -> str: ...
+
+
+def get_postcard_provider() -> PostcardProvider:
+    name = (settings.POSTCARD_PROVIDER or "pcm").lower()
+    if name == "pcm":
+        from directmail.providers.postcard.pcm import PcmProvider
+
+        return PcmProvider()
+    if name == "click2mail":
+        from directmail.providers.postcard.click2mail import Click2MailProvider
+
+        return Click2MailProvider()
+    if name == "postgrid":
+        from directmail.providers.postcard.postgrid import PostGridProvider
+
+        return PostGridProvider()
+    if name == "lob":
+        from directmail.providers.postcard.lob import LobProvider
+
+        return LobProvider()
+    from directmail.providers.postcard.pcm import PcmProvider
+
+    return PcmProvider()