feat(safety): invoice reconciliation on order detail

Add invoice total comparison in the order detail modal. When an order
has been invoiced, shows whether the invoice total matches the order
total — green badge if OK, red badge with difference amount if not.

Backend: compute reconciliation (difference, match) from existing
invoice.total_cu_tva vs order_total in order_detail endpoint.

Frontend: reconciliation badge below invoice info in modal, hidden
when no invoice exists.

Cache-bust: shared.js?v=17

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/templates/base.html

@@ -106,6 +106,7 @@
                             <div id="detailInvoiceInfo" style="display:none; margin-top:4px;">
                                 <small class="text-muted">Factura:</small> <span id="detailInvoiceNumber"></span>
                                 <span class="ms-2"><small class="text-muted">din</small> <span id="detailInvoiceDate"></span></span>
+                                <div id="detailInvoiceRecon" class="mt-1" style="display:none"></div>
                             </div>
                         </div>
                     </div>
@@ -142,7 +143,7 @@
 
     <script>window.ROOT_PATH = "{{ rp }}";</script>
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
-    <script src="{{ rp }}/static/js/shared.js?v=16"></script>
+    <script src="{{ rp }}/static/js/shared.js?v=17"></script>
     <script>
     // Dark mode toggle
     function toggleDarkMode() {