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>

database/migrations/2026_06_06_000001_create_hosting_settings_table.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('hosting_settings', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->unique()->constrained()->cascadeOnDelete();
+            $table->string('notify_email')->nullable();
+            $table->boolean('product_updates')->default(true);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('hosting_settings');
+    }
+};