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>

app/Services/Web/NewsroomDetailPageData.php

@@ -122,7 +122,7 @@ class NewsroomDetailPageData
             'newsroomStats' => [
                 'total' => $base()->count(),
                 'recent' => $base()->where('published_at', '>=', $recentSince)->count(),
-                'today' => $base()->whereDate('published_at', $referenceNow->toDateString())->count(),
+                'today' => $base()->whereBetween('published_at', [$referenceNow->copy()->startOfDay(), $referenceNow->copy()->endOfDay()])->count(),
                 'totalHits' => (int) $base()->sum('hits'),
                 'sinceYear' => $oldest ? (int) Carbon::parse($oldest)->format('Y') : null,
             ],