Show linked domains on cards and fix Email leftovers.

Display hosted_sites on account cards, scope Afia and Settings to hosting,
add hosting_settings for notifications, and remove mailbox UI from the
hosting layout and account pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

config/afia.php

@@ -1,8 +1,8 @@
 <?php
 
 return [
-    // Afia — Ladill Email's in-app AI assistant. Self-contained: the app calls
-    // the LLM directly with an email-specific prompt + the user's live context.
+    // Afia — in-app AI assistant. Product scope is set per deployed app (hosting | email).
+    'product' => env('AFIA_PRODUCT', 'hosting'),
     'enabled' => (bool) env('AFIA_ENABLED', true),
     'provider' => env('AFIA_PROVIDER', 'openai'), // openai | anthropic
     'model' => env('AFIA_MODEL', 'gpt-4o-mini'),