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

app/Enums/UserRole.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Enums;
+
+enum UserRole: string
+{
+    case USER = 'USER';
+    case MODERATOR = 'MODERATOR';
+    case ADMIN = 'ADMIN';
+    case SUPERUSER = 'SUPERUSER';
+
+    public function label(): string
+    {
+        return match($this) {
+            self::USER => 'User',
+            self::MODERATOR => 'Moderator',
+            self::ADMIN => 'Admin',
+            self::SUPERUSER => 'Superuser',
+        };
+    }
+
+    public function canModerate(): bool
+    {
+        return match($this) {
+            self::MODERATOR, self::ADMIN, self::SUPERUSER => true,
+            default => false,
+        };
+    }
+
+    public function canAdmin(): bool
+    {
+        return match($this) {
+            self::ADMIN, self::SUPERUSER => true,
+            default => false,
+        };
+    }
+}