ui: rebrand to cynfo GmbH, rename WLED-Geraete to Tuerschilder

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

templates/base.html

@@ -14,7 +14,7 @@
         <nav class="sidebar bg-dark text-white d-flex flex-column">
             <div class="p-3 border-bottom border-secondary">
                 <h5 class="mb-0"><i class="bi bi-lightbulb-fill text-warning"></i> Busylight</h5>
-                <small class="text-secondary">WLED Controller</small>
+                <small class="text-secondary">cynfo GmbH</small>
             </div>
             <ul class="nav flex-column mt-2 flex-grow-1">
                 <li class="nav-item">
@@ -29,7 +29,7 @@
                 </li>
                 <li class="nav-item">
                     <a class="nav-link text-white {% if page == 'devices' %}active{% endif %}" href="/devices">
-                        <i class="bi bi-router"></i> WLED-Geraete
+                        <i class="bi bi-router"></i> Tuerschilder
                     </a>
                 </li>
                 <li class="nav-item">