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/channels/__init__.py

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+"""Channel dispatch — postcard / direct mail."""
+
+from dataclasses import dataclass
+
+from contacts.models import Channel
+from directmail.models import Message
+from directmail.providers.postcard import get_postcard_provider
+
+
+@dataclass
+class ProviderResult:
+    provider: str
+    provider_id: str
+
+
+def dispatch_message(message: Message) -> ProviderResult:
+    if message.channel == Channel.POSTCARD:
+        provider = get_postcard_provider()
+        result = provider.send_postcard(message)
+        return ProviderResult(provider=provider.name, provider_id=result.provider_id)
+    raise ValueError(f"Unsupported channel: {message.channel}")