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'

tests/Feature/VerifyApiKeyMiddlewareTest.php

@@ -4,7 +4,7 @@ use App\Models\User;
 use Laravel\Sanctum\Sanctum;
 
 it('rejects requests without api key or sanctum session', function (): void {
-    $response = $this->getJson('/api/stations?postcode=SW1A1AA&fuel_type=petrol');
+    $response = $this->getJson('/api/stations?postcode=SW1A1AA&fuel_type=e10');
 
     $response->assertStatus(403);
 });
@@ -13,7 +13,7 @@ it('accepts requests with valid api key', function (): void {
     config(['app.api_secret_key' => 'test-secret']);
 
     $response = $this->withHeader('X-Api-Key', 'test-secret')
-        ->getJson('/api/stations?postcode=SW1A1AA&fuel_type=petrol');
+        ->getJson('/api/stations?postcode=SW1A1AA&fuel_type=e10');
 
     // 403 would mean middleware rejected — any other status means it passed through
     expect($response->status())->not->toBe(403);
@@ -23,7 +23,7 @@ it('accepts requests from sanctum authenticated users', function (): void {
     $user = User::factory()->create();
     Sanctum::actingAs($user);
 
-    $response = $this->getJson('/api/stations?postcode=SW1A1AA&fuel_type=petrol');
+    $response = $this->getJson('/api/stations?postcode=SW1A1AA&fuel_type=e10');
 
     expect($response->status())->not->toBe(403);
 });