feat(08-10-receipt-module): phases 08-10 complete — receipt issuing from orders

Phase 08 — DB Foundation:
- 3 new tables: receipt_configs, receipts, receipt_number_counters
- company_settings extended with BDO, REGON, KRS, logo fields

Phase 09 — Receipt Config:
- CRUD for receipt configurations (Settings > Accounting)
- ReceiptConfigController + ReceiptConfigRepository

Phase 10 — Receipt Issuing:
- ReceiptRepository with atomic numbering (INSERT ON DUPLICATE KEY UPDATE)
- ReceiptController with snapshot pattern (seller/buyer/items as JSON)
- "Wystaw paragon" button in order view
- Documents tab showing both receipts and marketplace documents
- Activity log entry on receipt creation

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

resources/views/layouts/app.php

@@ -79,6 +79,9 @@
             <a class="sidebar__sublink<?= $currentMenu === 'settings' && $currentSettings === 'company' ? ' is-active' : '' ?>" href="/settings/company">
               <?= $e($t('navigation.company')) ?>
             </a>
+            <a class="sidebar__sublink<?= $currentMenu === 'settings' && $currentSettings === 'accounting' ? ' is-active' : '' ?>" href="/settings/accounting">
+              <?= $e($t('navigation.accounting')) ?>
+            </a>
           </div>
         </details>
       </nav>