feat: 添加局域网设备发现功能和链路胶囊优化

- 实现局域网设备发现面板，支持探测ESP32中继板并自动切换端点
- 添加POST /api/lan/probe接口用于设备探测，返回三态判决结果
- 实现快扫和全段扫描两种模式，支持种子地址优先探测
- 添加端点唯一写手机制，防止多处同时修改设备IP
- 优化链路胶囊UI显示WiFi/EtherCAT/BLE连接状态和设备名称
- 修复EtherCAT链路OTA刷写期间PDO循环暂停和AL状态处理问题
- 调整PDO周期设置范围为0.125-4ms，支持亚毫秒显示为微秒
- 添加ESP32 WiFi使能开关控件样式和数据来源角标显示

pages/can_monitor.html

@@ -7,9 +7,9 @@
 <!-- 空 favicon：阻止浏览器自动请求 /favicon.ico（本地静态服务无此文件会 404） -->
 <link rel="icon" href="data:,">
 <link rel="stylesheet" href="../css/base.css?v=857f83a5">
-<link rel="stylesheet" href="../css/layout.css?v=acd17001">
+<link rel="stylesheet" href="../css/layout.css?v=20260926a">
 <link rel="stylesheet" href="../css/components.css?v=quiet20260919a">
-<link rel="stylesheet" href="../css/can.css?v=c06f5688">
+<link rel="stylesheet" href="../css/can.css?v=20260926a">
 <link rel="stylesheet" href="../css/responsive.css?v=quiet20260919a">
 </head>
 <body class="can-page">
@@ -17,11 +17,24 @@
 
   <header class="header-bar can-header">
     <div class="header-brand">
-      <span class="dot-mark"></span>
-      <strong>ESP32 CAN 接收监控</strong>
+      <span class="brand-logo" aria-hidden="true">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" stroke-linejoin="round">
+          <rect x="6" y="6" width="12" height="12" rx="2.5"/>
+          <rect x="9.5" y="9.5" width="5" height="5" rx="1" fill="currentColor" stroke="none" opacity=".85"/>
+          <path d="M9 2v3M15 2v3M9 19v3M15 19v3M2 9h3M2 15h3M19 9h3M19 15h3"/>
+        </svg>
+      </span>
+      <div class="brand-text">
+        <strong>ESP32 CAN 接收监控</strong>
+        <span class="brand-sub">DCU · Robot_v2 · CAN FD</span>
+      </div>
     </div>
     <div class="header-status">
-      <span class="pill offline" id="monConnPill"><span class="indicator"></span><span id="monConnTxt">未连接</span></span>
+      <span class="pill offline link-pill" id="canNetPill" title="ESP32 WiFi（/system/status）">
+        <span class="indicator"></span><span id="canNetTxt">未连接</span>
+      </span>
+      <span class="pill" id="canUptimePill">运行 --</span>
+      <span class="pill" id="canVersionPill">v--</span>
       <span class="pill" id="fbModePill">模式: --</span>
       <span class="pill" id="fbPollStatus">轮询: 待连接</span>
     </div>
@@ -51,6 +64,14 @@
             <button class="btn btn-outline btn-sm" id="btnModeBridge" type="button" title="CAN0 收到的每一帧按原帧格式自动转发到 CAN1 与 CAN2">CAN0→1/2 桥接</button>
           </div>
         </div>
+        <div class="can-toolbar-block">
+          <label class="form-label">发送静默（只听不发）</label>
+          <div class="input-group">
+            <button class="btn btn-outline btn-sm" id="btnSilent0" type="button" title="切换 CH0 只听不发">CH0 只听不发</button>
+            <button class="btn btn-outline btn-sm" id="btnSilent1" type="button" title="切换 CH1 只听不发">CH1 只听不发</button>
+            <button class="btn btn-outline btn-sm" id="btnSilent2" type="button" title="切换 CH2 只听不发">CH2 只听不发</button>
+          </div>
+        </div>
       </div>
       <div class="can-toolbar-foot">
         <div class="conn-indicator err" id="monConnIndicator">
@@ -184,6 +205,6 @@
   <span id="toastMsg">操作成功</span>
 </div>
 
-<script type="module" src="../js/can_monitor.js?v=20260919a"></script>
+<script type="module" src="../js/can_monitor.js?v=20261010a"></script>
 </body>
 </html>