feat(simplify): hide advanced settings

Move Kit Pricing, Price Sync, and Dashboard Polling sections under a
collapsed "Setari avansate" toggle. Basic settings remain visible.
Tooltip warns: "Modificati doar la indicatia echipei tehnice."

Cache-bust: settings.js?v=9

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

api/app/templates/settings.html

@@ -157,6 +157,11 @@
     </div>
 </div>
 
+<div class="mt-4">
+    <button class="btn btn-sm btn-outline-secondary" type="button" data-bs-toggle="collapse" data-bs-target="#advancedSettings" aria-expanded="false" title="Modificati doar la indicatia echipei tehnice">
+        <i class="bi bi-gear"></i> Setari avansate
+    </button>
+    <div class="collapse mt-2" id="advancedSettings">
         <div class="row g-3 mb-3">
             <div class="col-md-6">
                 <div class="card h-100">
@@ -237,6 +242,8 @@
                 </div>
             </div>
         </div>
+    </div>
+</div>
 
 <div class="mb-3">
     <button class="btn btn-primary btn-sm" onclick="saveSettings()">Salvează Setările</button>
@@ -246,5 +253,5 @@
 {% endblock %}
 
 {% block scripts %}
-<script src="{{ request.scope.get('root_path', '') }}/static/js/settings.js?v=8"></script>
+<script src="{{ request.scope.get('root_path', '') }}/static/js/settings.js?v=9"></script>
 {% endblock %}