feat: enhance ticket printing with QR code and improve Dockerfile\n\n- Added a QR code to printed tickets for customer feedback.\n- Improved Dockerfile for better caching and using npm start.\n- Updated print styles and fixed a print area error.\n- Minor updates to index.html and .dockerignore.

ap-pos/index.html

@@ -325,13 +325,9 @@
     </div>
   </main>
 
-  <footer class="main-footer-credits">
-    <p>v0.3.0</p>
-  </footer>
-
-  <!-- Área de impresión oculta -->
   <div id="printArea" class="no-print"></div>
 
+  <script src="https://cdn.jsdelivr.net/npm/qrcode@1/build/qrcode.min.js"></script>
   <script type="module" src="app.js?v=1.3"></script>
 </body>
 </html>