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

app/Enums/ThemePreference.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Enums;
+
+enum ThemePreference: string
+{
+    case LIGHT = 'light';
+    case DARK = 'dark';
+
+    public function label(): string
+    {
+        return match($this) {
+            self::LIGHT => 'Light',
+            self::DARK => 'Dark',
+        };
+    }
+
+    public function cssClass(): string
+    {
+        return match($this) {
+            self::LIGHT => 'theme-light',
+            self::DARK => 'theme-dark',
+        };
+    }
+}