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/Models/ContactMessage.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\ContactMessageStatus;
+use App\Enums\ContactMessageTopic;
+use Database\Factories\ContactMessageFactory;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * Kontakt-Anliegen aus dem schwebenden Kontakt-Widget (Kontaktaufnahme,
+ * Fehlermeldung, PM-Meldung, Feedback). Bewusst OHNE PortalScope: die
+ * Admin-Queue „Kontakt" sieht alle Portale; das Portal wird zur Anzeige/
+ * Filterung als eigene Spalte gehalten.
+ */
+class ContactMessage extends Model
+{
+    /** @use HasFactory<ContactMessageFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'portal',
+        'topic',
+        'status',
+        'name',
+        'email',
+        'message',
+        'page_url',
+        'payload',
+        'requester_ip',
+        'user_id',
+        'resolved_by_user_id',
+        'admin_note',
+        'resolved_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'topic' => ContactMessageTopic::class,
+            'status' => ContactMessageStatus::class,
+            'payload' => 'array',
+            'resolved_at' => 'datetime',
+        ];
+    }
+
+    /**
+     * Öffentliche Vorgangsnummer — analog zu Legal-Requests ("M-{id}").
+     */
+    public function reference(): string
+    {
+        return 'KT-'.$this->id;
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function resolver(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'resolved_by_user_id');
+    }
+
+    /**
+     * @param  Builder<ContactMessage>  $query
+     * @return Builder<ContactMessage>
+     */
+    public function scopeOpen(Builder $query): Builder
+    {
+        return $query->whereIn('status', [
+            ContactMessageStatus::Open->value,
+            ContactMessageStatus::InProgress->value,
+        ]);
+    }
+}