style: dart format analytics_service（CI 门禁要求）

lib/analytics/analytics_service.dart

@@ -40,7 +40,10 @@ class AnalyticsService {
 
   /// Tracks event (never throws, never awaits network). Props are validated
   /// for privacy red-line patterns locally before queuing.
-  Future<void> trackEvent(String eventName, [Map<String, dynamic>? props]) async {
+  Future<void> trackEvent(
+    String eventName, [
+    Map<String, dynamic>? props,
+  ]) async {
     try {
       if (props != null && _containsForbiddenField(props)) {
         debugPrint('Analytics: event $eventName rejected (forbidden field)');
@@ -57,7 +60,9 @@ class AnalyticsService {
         'clientTs': DateTime.now().toUtc().toIso8601String(),
         'appVersion': '1.0.0+1', // TODO: read from package_info_plus
         'platform': Platform.isAndroid ? 'android' : 'ios',
-        'osVersion': Platform.isAndroid ? 'android-14' : 'ios-17', // TODO: device_info_plus
+        'osVersion': Platform.isAndroid
+            ? 'android-14'
+            : 'ios-17', // TODO: device_info_plus
         if (props != null && props.isNotEmpty) 'props': props,
       };
 
@@ -90,8 +95,8 @@ class AnalyticsService {
       if (token != null) 'Authorization': 'Bearer $token',
     };
 
-    final request = await HttpClient()
-        .postUrl(Uri.parse('$_apiBaseUrl/api/v1/events'))
+    final request =
+        await HttpClient().postUrl(Uri.parse('$_apiBaseUrl/api/v1/events'))
           ..headers.contentType = ContentType.json;
     if (token != null) {
       request.headers.add('Authorization', 'Bearer $token');