feat(safety): price comparison on order detail

Add ROA price comparison to order detail modal — operators can now see
if GoMag prices match Oracle before invoicing. Eliminates the #1 risk
of invoicing with wrong prices.

Backend:
- New get_prices_for_order() in validation_service.py — batch Oracle
  query with dual-policy routing (sales/production by cont 341/345),
  PRETURI_CU_TVA handling, kit total calculation
- Extend GET /api/sync/order/{orderNumber} with per-item pret_roa and
  order-level price_check summary
- GET /api/dashboard/orders returns price_match=null (lightweight)

Frontend:
- Modal: price check badge (green/red/grey), "Pret GoMag" + "Pret ROA"
  columns, match dot per row, mismatch rows highlighted
- Dashboard: price dot column (₽) in orders table
- Mobile: inline mismatch indicator

Cache-bust: shared.js?v=16, dashboard.js?v=28

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

api/app/templates/dashboard.html

@@ -99,10 +99,11 @@
                         <th class="text-end">Discount</th>
                         <th class="text-end">Total</th>
                         <th style="width:28px" title="Facturat">F</th>
+                        <th class="text-center" style="width:30px" title="Preturi ROA">₽</th>
                     </tr>
                 </thead>
                 <tbody id="dashOrdersBody">
-                    <tr><td colspan="9" class="text-center text-muted py-3">Se incarca...</td></tr>
+                    <tr><td colspan="10" class="text-center text-muted py-3">Se incarca...</td></tr>
                 </tbody>
             </table>
         </div>
@@ -113,5 +114,5 @@
 {% endblock %}
 
 {% block scripts %}
-<script src="{{ request.scope.get('root_path', '') }}/static/js/dashboard.js?v=27"></script>
+<script src="{{ request.scope.get('root_path', '') }}/static/js/dashboard.js?v=28"></script>
 {% endblock %}