fix: add X-Api-Key header to API feature tests and register auth routes

tests/Feature/Api/AuthControllerTest.php

@@ -5,6 +5,10 @@ use Illuminate\Foundation\Testing\RefreshDatabase;
 
 uses(RefreshDatabase::class);
 
+beforeEach(function () {
+    $this->withHeaders(['X-Api-Key' => config('app.api_secret_key')]);
+});
+
 it('registers a new user and returns a token', function () {
     $this->postJson('/api/auth/register', [
         'name' => 'Test User',

tests/Feature/Api/PredictionControllerTest.php

@@ -7,6 +7,10 @@ use Illuminate\Foundation\Testing\RefreshDatabase;
 
 uses(RefreshDatabase::class);
 
+beforeEach(function () {
+    $this->withHeaders(['X-Api-Key' => config('app.api_secret_key')]);
+});
+
 it('returns a prediction response for diesel', function () {
     $this->getJson('/api/prediction?fuel_type=diesel')
         ->assertOk()

tests/Feature/Api/StationControllerTest.php

@@ -8,6 +8,10 @@ use Illuminate\Support\Facades\Http;
 
 uses(RefreshDatabase::class);
 
+beforeEach(function () {
+    $this->withHeaders(['X-Api-Key' => config('app.api_secret_key')]);
+});
+
 it('returns stations near coordinates filtered by fuel type', function () {
     $station = Station::factory()->create(['lat' => 52.555064, 'lng' => -0.256119]);
     StationPriceCurrent::factory()->create([

tests/Feature/Api/StatsControllerTest.php

@@ -5,6 +5,10 @@ use Illuminate\Foundation\Testing\RefreshDatabase;
 
 uses(RefreshDatabase::class);
 
+beforeEach(function () {
+    $this->withHeaders(['X-Api-Key' => config('app.api_secret_key')]);
+});
+
 it('returns search stats for current week', function () {
     // 10 searches within the rolling 7 days (3 unique IPs)
     Search::factory()->count(5)->create([