Add models, enums, and services for user roles, theme preferences, slug history, and ID generation

app/Models/SlugHistory.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+
+class SlugHistory extends Model
+{
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array<string>
+     */
+    protected $fillable = [
+        'slug',
+    ];
+
+    /**
+     * Get the parent sluggable model.
+     */
+    public function sluggable(): MorphTo
+    {
+        return $this->morphTo();
+    }
+}