Phase 2: Implement Domain & Mailbox persistence, Analytics, and fix pagination issues

app/Models/Domain.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Domain extends Model
+{
+    /** @use HasFactory<\Database\Factories\DomainFactory> */
+    use HasFactory, SoftDeletes;
+
+    protected $fillable = [
+        'domain_hash',
+        'name',
+        'allowed_types',
+        'is_active',
+        'is_archived',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'allowed_types' => 'array',
+            'is_active' => 'boolean',
+            'is_archived' => 'boolean',
+        ];
+    }
+
+    protected static function booted(): void
+    {
+        static::creating(function (Domain $domain) {
+            if (empty($domain->domain_hash)) {
+                $domain->domain_hash = bin2hex(random_bytes(32));
+            }
+        });
+    }
+
+    public function mailboxes()
+    {
+        return $this->hasMany(Mailbox::class, 'domain_hash', 'domain_hash');
+    }
+}