fix: use QJsonObject for event logger messages

Use QJsonObject directly for EventLoggerData messages so JSON payloads are preserved when writing event logs. Remove the string key/value
helper that no longer matches the object-based message payload.

使用 QJsonObject 直接承载 EventLoggerData 的 message 字段，确保写入事件日志时保留 JSON 载荷内容。移除不再匹配对象化 message
载荷的字符串键值辅助接口。

Author: Ivy233

cpp-include/eventlogger.hpp

@@ -40,16 +40,16 @@ typedef struct _EventLoggerData
 {
     qint64 tid;
     QString target;
-    QMap<QString, QString> message;
+    QJsonObject message;
 
     _EventLoggerData()
         : tid(0)
         , target(QString())
-        , message(QMap<QString, QString>())
+        , message(QJsonObject())
     {
     }
 
-    _EventLoggerData(qint64 tid, const QString &target, const QMap<QString, QString> &message)
+    _EventLoggerData(qint64 tid, const QString &target, const QJsonObject &message)
         : tid(tid)
         , target(target)
         , message(message)
@@ -89,11 +89,6 @@ class EventLogger
         m_writeEventLog(json.toJson(QJsonDocument::Compact).toStdString());
     }
 
-    void writeEventLog(qint64 tid, const QString &target, const QString &key, const QString &value)
-    {
-        writeEventLog(EventLoggerData(tid, target, {{key, value}}));
-    }
-
     bool init(QString package_id, bool enable_sig)
     {
         if (!shouldEnableEventLog()) {
@@ -153,14 +148,7 @@ class EventLogger
         QJsonObject jsonObject;
         jsonObject["tid"] = data.tid;
         jsonObject["target"] = data.target;
-        QJsonObject msgJson;
-        QMapIterator<QString, QString> iterator(data.message);
-        while (iterator.hasNext()) {
-            iterator.next();
-            msgJson[iterator.key()] = iterator.value();
-        }
-
-        jsonObject["message"] = msgJson;
+        jsonObject["message"] = data.message;
         QJsonDocument jsonDocument(jsonObject);
         return jsonDocument;
     }