feat: Refactor provisioning to instance requests and enhance subdomain availability check

Website/templates/my_invoices.html

@@ -46,8 +46,8 @@
 </section>
 
 <section class="panel">
-    <h2>Provisionierungsanfragen</h2>
-    <p>Hier siehst du den Status deiner angeforderten Instanzen/ Buchungen, die vom Admin geprüft werden.</p>
+    <h2>Instanz-Anfragen</h2>
+    <p>Hier siehst du den Status deiner angeforderten Instanzen/Buchungen, die vom Admin geprüft werden.</p>
 </section>
 
 <section class="table-wrap">
@@ -62,7 +62,7 @@
             </tr>
         </thead>
         <tbody>
-            {% for prov in provision_requests %}
+            {% for prov in instance_requests %}
             <tr>
                 <td>{{ prov.booking_number or prov.booking_number }}</td>
                 <td>{{ prov.package_label or prov.package }}</td>
@@ -70,7 +70,7 @@
                 <td>{{ '%.2f'|format(prov.amount_eur or 0) }} EUR</td>
                 <td>
                     {{ prov.provision_status or 'not_started' }}
-                    <form method="post" action="{{ url_for('provision_delete') }}" style="display:inline-block; margin-left:0.6rem;">
+                    <form method="post" action="{{ url_for('instance_request_delete') }}" style="display:inline-block; margin-left:0.6rem;">
                         <input type="hidden" name="prov_id" value="{{ prov.id }}">
                         <button type="submit" class="danger">Löschen</button>
                     </form>