feat(pdf): add DomPDF integration and ebook download feature

Integrate barryvdh/laravel-dompdf package for PDF generation with
custom configuration. Add authenticated ebook download route and view.
Update footer to display ebook download link for logged-in users.

routes/web.php

@@ -116,4 +116,12 @@ Route::post('/cookie-consent', [App\Http\Controllers\Legal\CookieConsentControll
     ->middleware(['web'])
     ->name('cookie.consent.store');
 
+Route::get('ebook/download', function () {
+    $path = public_path('ebooks/GPrompt-Ebook-Desenvolvedores-v1.pdf');
+    if (!file_exists($path)) {
+        abort(404, 'Ebook não encontrado');
+    }
+    return response()->file($path, ['Content-Type' => 'application/pdf']);
+})->name('ebook.download');
+
 require __DIR__.'/auth.php';