ver. 0.314: fix wyszukiwarki admin + title zamówienia

- Fix: globalna wyszukiwarka - Content-Type, Cache-Control, POST,
  FETCH_ASSOC, try/catch wrapper
- New: document.title w szczegółach zamówienia = numer zamówienia

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin/templates/shop-order/order-details.php

@@ -3,6 +3,7 @@ $orderId = (int)($this -> order['id'] ?? 0);
 ?>
 
 <div class="site-title">Szczegóły zamówienia: <?= htmlspecialchars((string)($this -> order['number'] ?? ''), ENT_QUOTES, 'UTF-8');?></div>
+<script>document.title = 'Zamówienie <?= htmlspecialchars((string)($this -> order['number'] ?? ''), ENT_QUOTES, 'UTF-8');?> - shopPro';</script>
 
 <div class="od-actions mb15">
   <a href="/admin/shop_order/list/" class="btn btn-dark btn-sm">