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'

routes/api.php

@@ -1,17 +1,25 @@
 <?php
 
+use App\Enums\FuelType;
 use App\Http\Controllers\Api\AuthController;
 use App\Http\Controllers\Api\PredictionController;
 use App\Http\Controllers\Api\StationController;
 use App\Http\Controllers\Api\StatsController;
 use App\Http\Controllers\Api\UserController;
 use App\Http\Middleware\VerifyApiKey;
+use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\Route;
 
 // Public endpoints (no API key required)
 Route::post('/auth/register', [AuthController::class, 'register']);
 Route::post('/auth/login', [AuthController::class, 'login']);
 
+Route::get('/fuel-types', function () {
+    return Cache::remember('api:fuel-types', now()->addDay(), fn () => collect(FuelType::cases())
+        ->map(fn (FuelType $case) => ['value' => $case->value, 'label' => $case->label()])
+        ->values());
+});
+
 // Protected endpoints (API key required)
 Route::middleware(['throttle:60,1', VerifyApiKey::class])->group(function (): void {
     Route::get('/stations', [StationController::class, 'index']);