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

resources/views/errors/403.blade.php

@@ -0,0 +1,24 @@
+@extends('layouts.app')
+
+@section('title', 'Acesso Negado')
+
+@section('content')
+<div class="container py-5">
+    <div class="row justify-content-center align-items-center" style="min-height: 60vh;">
+        <div class="col-md-6 text-center">
+            <div class="mb-4">
+                <i class="bi bi-lock text-danger"></i>
+            </div>
+            <h1 class="display-4 fw-bold text-danger mb-3">403</h1>
+            <h2 class="h4 mb-3">Acesso Negado</h2>
+            <p class="text-muted mb-4">
+                Você não tem permissão para acessar esta seção do sistema.<br>
+                Entre em contato com o administrador caso precise de acesso.
+            </p>
+            <a href="{{ route('home') }}" class="btn btn-primary btn-lg px-5">
+                <i class="bi bi-house me-2"></i> Voltar ao Dashboard
+            </a>
+        </div>
+    </div>
+</div>
+@endsection