feat(26-manual-tracking-number): reczne dodawanie numeru przesylki do zamowienia

Nowy endpoint POST /orders/{id}/shipment/manual z formularzem inline
w zakladce Przesylki. Reuse tabeli shipment_packages (provider='manual',
status='created'). Activity log, walidacja CSRF, HTML required.

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

resources/scss/app.scss

@@ -1574,6 +1574,16 @@ h4.section-title {
   display: block;
 }
 
+.manual-tracking-form {
+  display: flex;
+  gap: 8px;
+  align-items: center;
+
+  .form-control {
+    max-width: 220px;
+  }
+}
+
 .order-empty-placeholder {
   border: 1px dashed #cbd5e1;
   border-radius: 8px;