Backend-WIP: Kontakt-Queue, Page-Cache, Validierungs-Feedback, i18n

Gebuendelt, da ueber gemeinsame lang-/Service-Dateien verschraenkt:
- Kontakt-Nachrichten: contact_messages-Tabelle + Model/Enums/Factory,
  Admin-Queue (livewire/admin/contact-messages), ContactController
  persistiert das Anliegen zusaetzlich zur Brand-Mail
- Page-Data-Cache (Services/Web/*PageData) + web-archive-Indizes auf
  press_releases
- Validierungs-Feedback + Company-Portal-Restriction (Feature-Tests)
- i18n-Auslagerung lang/de|en (auth, passwords, validation, static)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/Feature/CustomerPressKitCreatePhase8eTest.php

@@ -90,17 +90,28 @@ test('save lehnt unbekannte Portal-Werte ab', function () {
         ->assertHasErrors(['portal']);
 });
 
-test('save akzeptiert Portal Both', function () {
+test('save lehnt Portal Both ab', function () {
     /** @var TestCase $this */
     $customer = makeCustomerForCreate();
 
     LivewireVolt::actingAs($customer)
         ->test('customer.press-kits.create')
         ->set('name', 'Beide Portale GmbH')
-        ->set('portal', 'both')
+        ->set('portal', Portal::Both->value)
         ->call('save')
-        ->assertHasNoErrors();
+        ->assertHasErrors(['portal']);
 
-    expect(Company::query()->withoutGlobalScopes()->where('name', 'Beide Portale GmbH')->value('portal'))
-        ->toBe(Portal::Both);
+    expect(Company::query()->withoutGlobalScopes()->where('name', 'Beide Portale GmbH')->exists())
+        ->toBeFalse();
+});
+
+test('Portal-Auswahl bietet Beide Portale nicht an', function () {
+    /** @var TestCase $this */
+    $customer = makeCustomerForCreate();
+
+    LivewireVolt::actingAs($customer)
+        ->test('customer.press-kits.create')
+        ->assertSeeText(Portal::Presseecho->label())
+        ->assertSeeText(Portal::Businessportal24->label())
+        ->assertDontSeeText(Portal::Both->label());
 });