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/Http/Controllers/Api/UserController.php

@@ -2,6 +2,7 @@
 
 namespace App\Http\Controllers\Api;
 
+use App\Enums\FuelType;
 use App\Http\Controllers\Controller;
 use App\Models\User;
 use Illuminate\Http\JsonResponse;
@@ -25,7 +26,7 @@ final class UserController extends Controller
     public function updatePreferences(Request $request): JsonResponse
     {
         $validated = $request->validate([
-            'preferred_fuel_type' => ['sometimes', Rule::in(['petrol', 'diesel', 'e5', 'b7_premium', 'b10', 'hvo'])],
+            'preferred_fuel_type' => ['sometimes', Rule::in(array_column(FuelType::cases(), 'value'))],
             'postcode' => ['sometimes', 'string', 'max:8'],
         ]);