Fix OGC API URL: Items → items (lowercase)

The OGC API endpoint is case-sensitive and requires lowercase 'items'.

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

app/templates/stiftung/land_detail.html

@@ -26,7 +26,7 @@
         <div class="col-md-4 text-end">
             <div class="btn-group" role="group">
                 {% if land.alkis_kennzeichen %}
-                <a href="https://ogc-api.nrw.de/lika/v1/collections/flurstueck/Items/{{ land.alkis_kennzeichen|urlencode }}"
+                <a href="https://ogc-api.nrw.de/lika/v1/collections/flurstueck/items/{{ land.alkis_kennzeichen|urlencode }}"
                    class="btn btn-outline-success" title="Flurstück im Kataster anzeigen" target="_blank" rel="noopener">
                     <i class="fas fa-map-marked-alt me-2"></i>Kataster
                 </a>

app/templates/stiftung/land_list.html

@@ -250,7 +250,7 @@
                                             <i class="fas fa-eye"></i>
                                         </a>
                                         {% if land.alkis_kennzeichen %}
-                                        <a href="https://ogc-api.nrw.de/lika/v1/collections/flurstueck/Items/{{ land.alkis_kennzeichen|urlencode }}"
+                                        <a href="https://ogc-api.nrw.de/lika/v1/collections/flurstueck/items/{{ land.alkis_kennzeichen|urlencode }}"
                                            class="btn btn-sm btn-outline-success" title="Kataster" target="_blank" rel="noopener">
                                             <i class="fas fa-map-marked-alt"></i>
                                         </a>