Add subscription tiers, notification preferences, and logging infrastructure

- Add database migrations for plans, subscriptions, notification preferences, and notification log tables
- Implement DispatchUserNotificationJob to handle channel resolution, daily limits, and logging (sent/tier_restricted/daily_limit)
- Add SendScheduledWhatsAppJob for scheduled notification delivery
- Create PlanFeatures service to resolve tier capabilities, check daily limits, and validate fuel

database/factories/UserNotificationPreferenceFactory.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Enums\FuelType;
+use App\Models\User;
+use App\Models\UserNotificationPreference;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<UserNotificationPreference>
+ */
+class UserNotificationPreferenceFactory extends Factory
+{
+    public function definition(): array
+    {
+        return [
+            'user_id' => User::factory(),
+            'channel' => fake()->randomElement(['email', 'push', 'whatsapp', 'sms']),
+            'fuel_type' => fake()->randomElement(array_column(FuelType::cases(), 'value')),
+            'enabled' => true,
+        ];
+    }
+}