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/services/ble/connection.js

@@ -239,6 +239,7 @@ function discoverServices(deviceId, callbacks) {
 // --- scan & connect ---
 
 function startScan(callbacks) {
+  var targetName = callbacks.targetDeviceId ? ('JW_' + callbacks.targetDeviceId).toUpperCase() : ''
   wx.openBluetoothAdapter({
     success: function () {
       wx.startBluetoothDevicesDiscovery({
@@ -251,10 +252,15 @@ function startScan(callbacks) {
               var d = devices[i]
               var name = (d.name || '').toUpperCase()
               var localName = (d.localName || '').toUpperCase()
-              var matched = name.indexOf('JW_') !== -1 || localName.indexOf('JW_') !== -1 ||
-                  name.indexOf('HOX') !== -1 || localName.indexOf('HOX') !== -1 ||
-                  name.indexOf('LIGHTMASK') !== -1 || localName.indexOf('LIGHTMASK') !== -1 ||
-                  name.indexOf('SIMPLE PERIPHERAL') !== -1 || localName.indexOf('SIMPLE PERIPHERAL') !== -1
+              var matched = false
+              if (targetName) {
+                matched = name === targetName || localName === targetName
+              } else {
+                matched = name.indexOf('JW_') !== -1 || localName.indexOf('JW_') !== -1 ||
+                    name.indexOf('HOX') !== -1 || localName.indexOf('HOX') !== -1 ||
+                    name.indexOf('LIGHTMASK') !== -1 || localName.indexOf('LIGHTMASK') !== -1 ||
+                    name.indexOf('SIMPLE PERIPHERAL') !== -1 || localName.indexOf('SIMPLE PERIPHERAL') !== -1
+              }
               if (matched) {
                 wx.stopBluetoothDevicesDiscovery({})
                 if (callbacks.onFound) callbacks.onFound(d)