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/ProofPdfAndExtraPmTest.php

@@ -6,6 +6,8 @@ use App\Enums\SinglePurchaseStatus;
 use App\Enums\SinglePurchaseType;
 use App\Exceptions\InsufficientCreditsException;
 use App\Exceptions\ProofPdfNotAvailableException;
+use App\Models\Company;
+use App\Models\Contact;
 use App\Models\Plan;
 use App\Models\PressRelease;
 use App\Models\User;
@@ -88,6 +90,61 @@ test('the rendered proof is a non-trivial pdf document', function () {
     expect(strlen($pdf))->toBeGreaterThan(800);
 });
 
+test('the rendered proof contains the full release, boilerplate, press contact and publisher', function () {
+    $company = Company::factory()->create([
+        'name' => 'Musterfirma GmbH',
+        'address' => 'Beispielweg 1, 10115 Berlin',
+        'boilerplate' => 'Die Musterfirma ist ein Beispielunternehmen mit Standardabbinder.',
+        'website' => 'https://musterfirma.example',
+    ]);
+    $contact = Contact::factory()->create([
+        'company_id' => $company->id,
+        'first_name' => 'Max',
+        'last_name' => 'Mustermann',
+        'responsibility' => 'Pressesprecher',
+        'email' => 'max@musterfirma.example',
+        'phone' => '030 1234567',
+    ]);
+    $pr = PressRelease::factory()->published()->create([
+        'company_id' => $company->id,
+        'title' => 'Grosse Ankuendigung',
+        'subtitle' => 'Ein aussagekraeftiger Untertitel',
+        'text' => '<p>Erster Absatz der Meldung.</p><p>Zweiter Absatz mit Schlusswort.</p>',
+    ]);
+    $pr->contacts()->attach($contact->id);
+
+    $pdf = app(ProofPdfRenderer::class)->render($pr);
+
+    expect($pdf)
+        ->toContain('Grosse Ankuendigung')
+        ->toContain('Untertitel')
+        ->toContain('Erster Absatz der Meldung.')
+        ->toContain('Schlusswort.')
+        ->toContain('Standardabbinder.')
+        ->toContain('Mustermann')
+        ->toContain('Pressesprecher')
+        ->toContain('max@musterfirma.example')
+        ->toContain('Musterfirma GmbH')
+        ->toContain('10115 Berlin')
+        ->toContain('https://musterfirma.example');
+});
+
+test('a long release flows over multiple numbered pages', function () {
+    $pr = PressRelease::factory()->published()->create([
+        'title' => 'Lange Meldung',
+        'text' => implode('', array_map(
+            static fn (int $i): string => '<p>Absatz '.$i.': '.str_repeat('Dies ist ein ausfuehrlicher Beispielsatz. ', 12).'</p>',
+            range(1, 12),
+        )),
+    ]);
+
+    $pdf = app(ProofPdfRenderer::class)->render($pr);
+
+    expect(substr_count($pdf, '/Type /Page /Parent'))->toBeGreaterThanOrEqual(2);
+    expect($pdf)->toContain('Seite 1 von');
+    expect($pdf)->toContain('Fortsetzung');
+});
+
 test('the rendered proof documents the real public url of the release', function () {
     $pr = PressRelease::factory()->published()->create([
         'portal' => Portal::Presseecho,