upd: DefaultController (#25)

add database transfer capability

templates/default/transfer_progress.html.twig

@@ -0,0 +1,24 @@
+{% extends 'base.html.twig' %}
+
+{% block body %}
+<div class="container mt-5 text-center">
+    <h2>Transferring Database...</h2>
+    <p>Processing: <strong>{{ current }}</strong></p>
+    
+    <div class="progress mb-3" style="height: 30px;">
+        <div class="progress-bar progress-bar-striped progress-bar-animated" 
+             role="progressbar" style="width: {{ progress }}%;">
+             {{ progress }}%
+        </div>
+    </div>
+
+    <p>Please do not close this window.</p>
+</div>
+
+<script>
+    // Automatically move to the next step after a short delay
+    setTimeout(() => {
+        window.location.href = "{{ path('app_admin_transfer_db', {step: next_step}) }}";
+    }, 500);
+</script>
+{% endblock %}