Remove obsolete Livewire fuel search components and consolidate pricing tiers

- Delete unused Livewire Search test and fuel type select Blade component
- Move subscription webhook listener from EventServiceProvider to AppServiceProvider
- Add FUEL_TYPES global config to app layout for client-side use
- Add Billable trait to User model and include email_verified_at in fillable
- Implement monthly/annual cadence toggle with pricing display and smart CTA routing on homepage
- Update VerifyApiKeyMiddlewareTest to use e10 instead of petrol
- Refactor PollFuelPrices to auto-refresh stale stations based on last_seen_at
- Add incremental polling with cached timestamp and effective-start-timestamp param to FuelPriceService
- Normalize amenities/fuel_types from API objects to flat arrays, skip stations missing required fields
- Log response body on API failures in ApiLogger
- Default homepage sort to 'reliable' instead of 'price'

app/Providers/AppServiceProvider.php

@@ -2,6 +2,7 @@
 
 namespace App\Providers;
 
+use App\Listeners\DowngradeUserOnSubscriptionDeleted;
 use App\Services\ApiLogger;
 use App\Services\LlmPrediction\AnthropicPredictionProvider;
 use App\Services\LlmPrediction\GeminiPredictionProvider;
@@ -10,8 +11,10 @@ use App\Services\LlmPrediction\OpenAiPredictionProvider;
 use Carbon\CarbonImmutable;
 use Illuminate\Support\Facades\Date;
 use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Event;
 use Illuminate\Support\ServiceProvider;
 use Illuminate\Validation\Rules\Password;
+use Laravel\Cashier\Events\WebhookReceived;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -37,6 +40,8 @@ class AppServiceProvider extends ServiceProvider
     public function boot(): void
     {
         $this->configureDefaults();
+
+        Event::listen(WebhookReceived::class, DowngradeUserOnSubscriptionDeleted::class);
     }
 
     /**