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/Mail/ContactRequestSubmitted.php

@@ -18,12 +18,20 @@ class ContactRequestSubmitted extends Mailable
         public readonly string $senderEmail,
         public readonly string $messageText,
         public readonly string $host,
+        public readonly ?string $topicLabel = null,
+        public readonly ?string $pageUrl = null,
     ) {}
 
     public function envelope(): Envelope
     {
+        $subject = 'Neue Kontaktanfrage über '.$this->host;
+
+        if ($this->topicLabel !== null && $this->topicLabel !== 'Kontaktaufnahme') {
+            $subject = 'Neue '.$this->topicLabel.' über '.$this->host;
+        }
+
         return new Envelope(
-            subject: 'Neue Kontaktanfrage über '.$this->host,
+            subject: $subject,
             replyTo: [new Address($this->senderEmail, $this->senderName)],
         );
     }