feat(cms): implement complete SysSiteCMS content management system

Initial implementation of the HomeSysPanel CMS built with Laravel 13.0.
Includes complete admin panel, content management, user authentication,
modular architecture for products/services/chatbot, and marketing tools.

Key features:
- User authentication with email verification and password reset
- Role-based access control (Admin/User with granular permissions)
- Content management (pages, news, FAQ, downloads, galleries, banners)
- Contact management system with subjects and responses
- Marketing tools (email campaigns, visitor analytics, social sharing)
- Modular architecture (Products, Services, Chatbot modules)
- AI Chatbot integration with OpenRouter.ai and LlamaCpp support
- Visitor tracking with geolocation
- SEO optimization with meta tags and Open Graph
- Responsive design with Bootstrap 5
- Dark mode support
- Maintenance mode
- Feature request system

app/Http/Middleware/CheckPermission.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Illuminate\Support\Facades\Auth;
+
+class CheckPermission
+{
+    /**
+     * Handle an incoming request.
+     * Checks if the authenticated user has the required permission.
+     * Admin users always pass. User types need the specific permission.
+     *
+     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
+     */
+    public function handle(Request $request, Closure $next, string $permission): Response
+    {
+        if (!Auth::check()) {
+            return redirect()->route('login');
+        }
+
+        $user = Auth::user();
+
+        if ($user->isAdmin()) {
+            return $next($request);
+        }
+
+        if ($user->hasPermission($permission)) {
+            return $next($request);
+        }
+
+        abort(403, 'Acesso negado. Você não tem permissão para acessar esta seção.');
+    }
+}