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/admin/contacts/index.blade.php

@@ -0,0 +1,67 @@
+@extends('layouts.admin')
+
+@section('title', 'Mensagens de Contato')
+
+@section('content')
+<div class="d-sm-flex align-items-center justify-content-between mb-4">
+    <h1 class="h3 mb-0 text-gray-800">Contatos Recebidos</h1>
+</div>
+
+@if(session('success'))
+    <div class="alert alert-success border-0 shadow-sm">{{ session('success') }}</div>
+@endif
+
+<div class="card shadow mb-4">
+    <div class="card-header py-3">
+        <h6 class="m-0 font-weight-bold text-primary">Mensagens</h6>
+    </div>
+    <div class="card-body">
+        <div class="table-responsive">
+            <table class="table table-bordered" width="100%" cellspacing="0">
+                <thead>
+                    <tr>
+                        <th>Status</th>
+                        <th>Data</th>
+                        <th>Nome</th>
+                        <th>Assunto</th>
+                        <th>WhatsApp</th>
+                        <th>Ações</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    @foreach($contacts as $contact)
+                    <tr class="{{ $contact->read ? 'text-muted' : 'font-weight-bold bg-light' }}">
+                        <td class="text-center">
+                            @if($contact->read)
+                                <i class="bi bi-envelope-open text-secondary" title="Lida"></i>
+                            @else
+                                <i class="bi bi-envelope-fill text-primary" title="Nova!"></i>
+                            @endif
+                        </td>
+                        <td>{{ $contact->created_at->format('d/m/Y H:i') }}</td>
+                        <td>{{ $contact->name }}</td>
+                        <td>{{ $contact->subject->name ?? 'N/A' }}</td>
+                        <td>{{ $contact->whatsapp ?? '-' }}</td>
+                        <td>
+                            <a href="{{ route('admin.contacts.show', $contact) }}" class="btn btn-sm btn-info">
+                                <i class="bi bi-eye"></i>
+                            </a>
+                            <form action="{{ route('admin.contacts.destroy', $contact) }}" method="POST" class="d-inline">
+                                @csrf
+                                @method('DELETE')
+                                <button type="submit" class="btn btn-sm btn-danger" onclick="return confirm('Tem certeza que deseja excluir esta mensagem?')">
+                                    <i class="bi bi-trash"></i>
+                                </button>
+                            </form>
+                        </td>
+                    </tr>
+                    @endforeach
+                </tbody>
+            </table>
+        </div>
+        <div class="mt-4">
+            {{ $contacts->links() }}
+        </div>
+    </div>
+</div>
+@endsection