改变了带有预设的聊天的实现逻辑，去除了正常聊天内容中“切换模型”这一指令

src/main/java/plugin/constant/ConfigConstant.java

@@ -0,0 +1,13 @@
+package plugin.constant;
+
+/**
+ * @author SLHAF
+ */
+public class ConfigConstant {
+
+    public static final String DEFAULT = "default";
+
+    public static final String NULL = "null";
+
+    public static final String CUSTOM_SPLIT = "\\|";
+}