Add searchChatHistory tool

src/main/kotlin/PluginConfig.kt

@@ -131,4 +131,10 @@ object PluginConfig : AutoSavePluginConfig("Config") {
 
     @ValueDescription("单个工具调用返回内容的最大字符数，超过将被截断并标注")
     val maxToolOutputLength: Int by value(15000)
+
+    @ValueDescription("聊天记录搜索最大天数")
+    val searchHistoryMaxDays: Int by value(7)
+
+    @ValueDescription("聊天记录搜索最大查询条数，防止内存溢出")
+    val searchHistoryMaxRecords: Int by value(500)
 }