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/web.php

@@ -1,5 +1,6 @@
 <?php
 
+use App\Http\Controllers\BillingController;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
 use Illuminate\Support\Facades\Route;
@@ -16,5 +17,12 @@ Route::get('/logout', function (Request $request) {
     return redirect('/');
 })->middleware('auth')->name('logout');
 
+Route::middleware(['auth'])->prefix('billing')->name('billing.')->group(function () {
+    Route::get('/checkout/{tier}/{cadence}', [BillingController::class, 'checkout'])->name('checkout');
+    Route::get('/portal', [BillingController::class, 'portal'])->name('portal');
+    Route::get('/success', [BillingController::class, 'success'])->name('success');
+    Route::get('/cancel', [BillingController::class, 'cancel'])->name('cancel');
+});
+
 // SPA catch-all — must be last
 Route::get('/{any?}', fn () => view('app'))->where('any', '.*')->name('home');