tests: gemeinsamer Testhelfer, DB_URL-Guard vor RefreshDatabase, Larastan voller Scope ohne Meldung (Umsetzungsaudit 29.09.: Q-01, Q-02; 02.10.: O02)

- makeCustomerForShowPhase8a() nach tests/Pest.php — die Suite läuft damit
  auch parallel (--parallel) und dateiweise grün
- phpunit.xml leert DB_URL, der Guard in TestCase::setUpTraits() bricht bei
  gesetzter url ab, bevor RefreshDatabase eine Verbindung öffnet
- HasUniqueSlug ohne widersprüchliche @var-Annotation

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/Feature/PressReleaseShowPhase8aTest.php

@@ -4,9 +4,6 @@ use App\Enums\Portal;
 use App\Enums\PressReleaseClassification;
 use App\Enums\PressReleaseContentTier;
 use App\Enums\PressReleaseStatus;
-use App\Models\Category;
-use App\Models\Company;
-use App\Models\Contact;
 use App\Models\PressRelease;
 use App\Models\User;
 use Database\Seeders\RolesAndPermissionsSeeder;
@@ -18,35 +15,6 @@ beforeEach(function (): void {
     $this->seed(RolesAndPermissionsSeeder::class);
 });
 
-/**
- * @return array{customer: User, company: Company, contact: Contact, category: Category, pr: PressRelease}
- */
-function makeCustomerForShowPhase8a(array $prAttributes = []): array
-{
-    $customer = User::factory()->create(['is_active' => true]);
-    $customer->assignRole('customer');
-
-    $company = Company::factory()->presseecho()->create();
-    $customer->companies()->attach($company->id, ['role' => 'owner']);
-
-    $contact = Contact::factory()->for($company)->create([
-        'portal' => $company->portal->value,
-    ]);
-    $category = Category::factory()->create();
-
-    $pr = PressRelease::factory()->create(array_merge([
-        'user_id' => $customer->id,
-        'company_id' => $company->id,
-        'category_id' => $category->id,
-        'portal' => $company->portal->value,
-        'status' => 'draft',
-    ], $prAttributes));
-
-    $pr->contacts()->sync([$contact->id]);
-
-    return compact('customer', 'company', 'contact', 'category', 'pr');
-}
-
 function makeAdminForShowPhase8a(): User
 {
     $admin = User::factory()->create(['is_active' => true]);