feat(29-delivery-status-mapping-ui): konfiguracja mapowania statusów dostawy per provider

Phase 29 complete (v1.3):
- Tabela delivery_status_mappings z DB overrides
- DeliveryStatus: normalizeWithOverrides(), descriptionWithOverrides(), getDefaultMappings()
- UI ustawień: tabela mapowań per provider (InPost/Apaczka/Allegro), bulk save, reset, resetAll
- 5 endpointów w routes/web.php, link w menu bocznym

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

resources/views/layouts/app.php

@@ -107,6 +107,9 @@
             <a class="sidebar__sublink<?= $currentMenu === 'settings' && $currentSettings === 'printing' ? ' is-active' : '' ?>" href="/settings/printing">
               Drukowanie
             </a>
+            <a class="sidebar__sublink<?= $currentMenu === 'settings' && $currentSettings === 'delivery-status-mappings' ? ' is-active' : '' ?>" href="/settings/delivery-status-mappings">
+              Mapowanie statusów dostawy
+            </a>
           </div>
         </details>
       </nav>