feat: support JW_ device ID format in QR scan and BLE matching

- parseDeviceId accepts hex with spaces (e.g. "672B6D5A 4DCD861")
- BLE scan does exact match on "JW_<device_id>" when target is known
- Manual input placeholder updated to show new format

miniprogram/pages/ble-connect/ble-connect.js

@@ -52,6 +52,7 @@ Page({
     }, SCAN_TIMEOUT)
 
     ble.startScan({
+      targetDeviceId: self.data.deviceId,
       onFound: function (device) {
         clearTimeout(self._scanTimer)
         self.setData({ state: 'connecting' })

miniprogram/pages/scan/scan.js

@@ -43,7 +43,9 @@ Page({
   },
 
   parseDeviceId: function (content) {
+    content = (content || '').trim()
     if (/^[0-9A-Fa-f]{16}$/.test(content)) return content
+    if (/^[0-9A-Fa-f]+([ _-][0-9A-Fa-f]+)+$/.test(content)) return content
     try {
       var url = new URL(content)
       var id = url.searchParams.get('device_id') || url.searchParams.get('id')
@@ -79,11 +81,11 @@ Page({
     wx.showModal({
       title: '手动输入设备号',
       editable: true,
-      placeholderText: '请输入16位设备ID',
+      placeholderText: '请输入设备ID，如 672B6D5A 4DCD861',
       success: function (res) {
         if (res.confirm && res.content) {
-          var deviceId = res.content.trim()
-          if (/^[0-9A-Fa-f]{16}$/.test(deviceId)) {
+          var deviceId = self.parseDeviceId(res.content)
+          if (deviceId) {
             self.bindDevice(deviceId)
           } else {
             wx.showToast({ title: '设备号格式不正确', icon: 'none' })