Firewall added & some fixes

public/index.html

@@ -62,9 +62,17 @@
     </svg>
     Клиенты
   </a>
-  <a href="/proxy.html" class="tab-link">
+  <a href="/firewall.html" class="tab-link">
     <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="15" height="15">
       <path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/>
+      <path d="M9 12l2 2 4-4"/>
+    </svg>
+    Файрвол
+  </a>
+  <a href="/proxy.html" class="tab-link">
+    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="15" height="15">
+      <circle cx="12" cy="12" r="3"/>
+      <path d="M12 1v4M12 19v4M4.22 4.22l2.83 2.83M16.95 16.95l2.83 2.83M1 12h4M19 12h4M4.22 19.78l2.83-2.83M16.95 7.05l2.83-2.83"/>
     </svg>
     Прокси
   </a>
@@ -88,6 +96,16 @@
     </div>
 
     <form id="configForm" autocomplete="off">
+
+      <!-- VLAN ID — shown only for VLAN interfaces -->
+      <div id="vlanIdSection" class="hidden">
+        <div class="form-row">
+          <label for="cfgVLANId">VLAN ID <span class="form-hint-inline">(1–4094)</span></label>
+          <input type="number" id="cfgVLANId" min="1" max="4094" placeholder="100">
+        </div>
+        <div class="form-divider"></div>
+      </div>
+
       <div class="form-row">
         <label class="checkbox-label">
           <input type="checkbox" id="cfgAuto">