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

js/ble/state.js

@@ -110,12 +110,24 @@ export function setReadyHint(html) {
 
 export function setConnectionState(connected) {
   const idle = connected && state.selectedFile && !state.uploading;
-  // BLE 模式：连接状态只写顶栏胶囊，避免下方重复文案
+  window.__bleConnState = !!connected;
+  // 顶栏 BLE 胶囊：连接后显示「设备名 · 设备ID」，未连接显示「未连接」
+  var pc = document.getElementById('pillBle');
+  var pct = document.getElementById('pillBleTxt');
+  if (pc) pc.className = 'pill link-pill ' + (connected ? 'online' : 'offline');
+  if (pct) {
+    if (connected) {
+      var nm = window.__bleDeviceName || '已连接';
+      var id = window.__bleDeviceId;
+      pct.textContent = id ? (nm + ' · ' + id) : nm;
+    } else {
+      pct.textContent = '未连接';
+    }
+  }
+  try {
+    if (window.updateLinkPills) window.updateLinkPills(null, !!connected);
+  } catch (_) {}
   if (typeof connectionMode !== 'undefined' && connectionMode === 'ble') {
-    var pc = document.getElementById('pillConn');
-    var pct = document.getElementById('pillConnTxt');
-    if (pc) pc.className = connected ? 'pill online' : 'pill offline';
-    if (pct) pct.textContent = connected ? 'BLE 已连接' : 'BLE 未连接';
     if (els.connState) {
       els.connState.textContent = connected ? '已连接' : '未连接';
       if (els.connState.parentElement) {
@@ -141,6 +153,8 @@ export function setConnectionState(connected) {
   els.abortBtn.disabled = !state.uploading;
 
   if (!connected) {
+    window.__bleDeviceName = '';
+    window.__bleDeviceId = '';
     setReadyHint('当前未连接设备。建议顺序：连接设备 → 选择固件 → 开始刷写。');
   } else if (!state.notificationsEnabled) {
     setReadyHint('设备已连接，正在自动准备刷写通道。若长时间无响应，请断开后重连。');
@@ -164,8 +178,8 @@ export function resetUiAfterDisconnect() {
   state.lastUploadStatus = 'idle';
   state.deviceSha256 = null;
   if (typeof connectionMode === 'undefined' || connectionMode === 'ble') {
-    els.deviceName.textContent = '-';
-    els.deviceId.textContent = '-';
+    window.__bleDeviceName = '';
+    window.__bleDeviceId = '';
     if (els.versionText) els.versionText.textContent = '未读取';
     var pv = document.getElementById('pillVer');
     if (pv) pv.textContent = 'v--';