new - DNS obf type for kcp

web/html/xui/form/outbound.html

@@ -255,6 +255,7 @@
                 <a-select-option value="wechat-video">WeChat</a-select-option>
                 <a-select-option value="dtls">DTLS 1.2</a-select-option>
                 <a-select-option value="wireguard">WireGuard</a-select-option>
+                <a-select-option value="dns">DNS</a-select-option>
             </a-select>
         </a-form-item>
         <a-form-item label='{{ i18n "password" }}'>