feat(#91): add multi color and palette support

app/Models/DevicePalette.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property array|null $colors
+ */
+final class DevicePalette extends Model
+{
+    use HasFactory;
+
+    protected $guarded = [];
+
+    protected $casts = [
+        'grays' => 'integer',
+        'colors' => 'array',
+    ];
+}