准备更新temp_avg相关字段能力

lib/pages/battery_health_page.dart

@@ -45,6 +45,7 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
   String _deviceModel = "魅族21 Pro (默认)";
   double _maxTemp = 0;
   double _minTemp = 0;
+  double _batteryTempAvg = 0;
   double _maxVolt = 0;
   double _minVolt = 0;
   bool _hasData = false;
@@ -359,6 +360,7 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
       final volt = _extractVolt(lastLine);
       final (maxTemp, minTemp) = _extractTempExtremes(validLines);
       final (maxVolt, minVolt) = _extractVoltExtremes(validLines);
+      final tempAvg = _extractTempAvg(validLines);
 
       dev.log(
         '🔵 字段提取: cycle=$cycle, temp=$temp, volt=$volt',
@@ -390,6 +392,7 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
         _currentCap = (validatedCap ?? _currentCap).toDouble();
         _cycleCount = cycle;
         _batteryTemp = temp;
+        _batteryTempAvg = tempAvg;
         _batteryVolt = volt;
         _maxTemp = maxTemp;
         _minTemp = minTemp;
@@ -494,6 +497,20 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
     return (maxTemp ?? 0, minTemp ?? 0);
   }
 
+  double _extractTempAvg(List<String> lines) {
+    final reg = RegExp(r'tbat=(\d+)');
+    double sum = 0;
+    int count = 0;
+    for (String line in lines) {
+      final match = reg.firstMatch(line);
+      if (match != null) {
+        sum += double.parse(match.group(1)!);
+        count++;
+      }
+    }
+    return count > 0 ? sum / count : 0;
+  }
+
   (double, double) _extractVoltExtremes(List<String> lines) {
     final reg = RegExp(r'vbat=(\d+)');
     double? maxVolt, minVolt;
@@ -773,6 +790,7 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
                             child: BatteryInfoPanel(
                               batteryVolt: _batteryVolt,
                               batteryTemp: _batteryTemp,
+                              tempAvg: _batteryTempAvg,
                               maxVolt: _maxVolt,
                               minVolt: _minVolt,
                               maxTemp: _maxTemp,