feat: implement user registration backend and temporarily disable routing panel in admin interface

admin.html

@@ -1281,7 +1281,7 @@
         </div>
 
         <!-- Routing & Radius Panel (Right) -->
-        <div class="routing-panel">
+        <!-- <div class="routing-panel">
           <h3>📍 ROUTING & RADIUS</h3>
           <button class="btn btn-sm" id="btn-nearest-spbu" style="width:100%; background:#2563eb; color:white; border:none; padding:8px; border-radius:6px; cursor:pointer; font-weight:600; font-size:12px; margin-bottom:6px;">📍 Cari SPBU Terdekat</button>
           <div id="nearest-spbu-result" style="font-size:11px; color:#94a3b8; margin-bottom:10px;"></div>
@@ -1292,7 +1292,7 @@
             <span id="radius-value">500 m</span>
             <span style="color:#64748b;">(Klik peta)</span>
           </div>
-        </div>
+        </div> -->
 
         <!-- Floating "Tambah Data" Toolbar -->
         <div id="map-add-toolbar" style="